SELECT 
  SQL_CALC_FOUND_ROWS (
    CASE WHEN products.parent_product_id <> 0 THEN products.parent_product_id ELSE products.product_id END
  ) AS product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  MIN(
    IF(
      prices.percentage_discount = 0, 
      prices.price, 
      prices.price - (
        prices.price * prices.percentage_discount
      )/ 100
    )
  ) as price, 
  GROUP_CONCAT(
    products.product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_ids, 
  GROUP_CONCAT(
    products.product_type 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_types, 
  GROUP_CONCAT(
    products.parent_product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS parent_product_ids, 
  products.product_type, 
  products.parent_product_id, 
  descr1.full_description as full_description 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_product_prices as prices_2 ON prices.product_id = prices_2.product_id 
  AND prices_2.lower_limit = 1 
  AND prices_2.price < prices.price 
  AND prices_2.usergroup_id IN (0, 0, 1) 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
WHERE 
  1 
  AND products.product_id NOT IN (139) 
  AND companies.status IN ('A') 
  AND prices.price >= 0.00 
  AND prices.price <= 0.00 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND prices_2.price IS NULL 
  AND products.company_id IN('1', '2', '3', '4', '5', '6') 
  AND products.product_type != 'D' 
GROUP BY 
  product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 3

Query time 0.00735

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "44.30"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": true,
        "buffer_result": {
          "using_temporary_table": true,
          "nested_loop": [
            {
              "table": {
                "table_name": "companies",
                "access_type": "ALL",
                "possible_keys": [
                  "PRIMARY"
                ],
                "rows_examined_per_scan": 6,
                "rows_produced_per_join": 1,
                "filtered": "16.67",
                "cost_info": {
                  "read_cost": "3.27",
                  "eval_cost": "0.20",
                  "prefix_cost": "3.47",
                  "data_read_per_join": "7K"
                },
                "used_columns": [
                  "company_id",
                  "status",
                  "company"
                ],
                "attached_condition": "((`atulecarter_atul_demo1`.`companies`.`status` = 'A') and (`atulecarter_atul_demo1`.`companies`.`company_id` in ('1','2','3','4','5','6')))"
              }
            },
            {
              "table": {
                "table_name": "cscart_categories",
                "access_type": "ALL",
                "possible_keys": [
                  "PRIMARY",
                  "c_status",
                  "p_category_id"
                ],
                "rows_examined_per_scan": 86,
                "rows_produced_per_join": 3,
                "filtered": "4.00",
                "using_join_buffer": "Block Nested Loop",
                "cost_info": {
                  "read_cost": "20.01",
                  "eval_cost": "0.69",
                  "prefix_cost": "24.16",
                  "data_read_per_join": "8K"
                },
                "used_columns": [
                  "category_id",
                  "storefront_id",
                  "usergroup_ids",
                  "status"
                ],
                "attached_condition": "(((`atulecarter_atul_demo1`.`cscart_categories`.`usergroup_ids` = '') or find_in_set(0,`atulecarter_atul_demo1`.`cscart_categories`.`usergroup_ids`) or find_in_set(1,`atulecarter_atul_demo1`.`cscart_categories`.`usergroup_ids`)) and (`atulecarter_atul_demo1`.`cscart_categories`.`status` in ('A','H')) and (`atulecarter_atul_demo1`.`cscart_categories`.`storefront_id` in (0,1)))"
              }
            },
            {
              "table": {
                "table_name": "products_categories",
                "access_type": "ref",
                "possible_keys": [
                  "PRIMARY",
                  "pt"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "category_id"
                ],
                "key_length": "3",
                "ref": [
                  "atulecarter_atul_demo1.cscart_categories.category_id"
                ],
                "rows_examined_per_scan": 3,
                "rows_produced_per_join": 10,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "3.63",
                  "eval_cost": "2.06",
                  "prefix_cost": "29.85",
                  "data_read_per_join": "165"
                },
                "used_columns": [
                  "product_id",
                  "category_id"
                ],
                "attached_condition": "(`atulecarter_atul_demo1`.`products_categories`.`product_id` <> 139)"
              }
            },
            {
              "table": {
                "table_name": "products",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "status"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "atulecarter_atul_demo1.products_categories.product_id"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 0,
                "filtered": "5.00",
                "cost_info": {
                  "read_cost": "10.32",
                  "eval_cost": "0.10",
                  "prefix_cost": "42.24",
                  "data_read_per_join": "2K"
                },
                "used_columns": [
                  "product_id",
                  "product_type",
                  "status",
                  "company_id",
                  "usergroup_ids",
                  "parent_product_id"
                ],
                "attached_condition": "((`atulecarter_atul_demo1`.`products`.`company_id` = `atulecarter_atul_demo1`.`companies`.`company_id`) and ((`atulecarter_atul_demo1`.`products`.`usergroup_ids` = '') or find_in_set(0,`atulecarter_atul_demo1`.`products`.`usergroup_ids`) or find_in_set(1,`atulecarter_atul_demo1`.`products`.`usergroup_ids`)) and (`atulecarter_atul_demo1`.`products`.`status` = 'A') and (`atulecarter_atul_demo1`.`products`.`product_type` <> 'D'))"
              }
            },
            {
              "table": {
                "table_name": "prices",
                "access_type": "ref",
                "possible_keys": [
                  "usergroup",
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "key": "usergroup",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "atulecarter_atul_demo1.products_categories.product_id"
                ],
                "rows_examined_per_scan": 3,
                "rows_produced_per_join": 0,
                "filtered": "3.26",
                "index_condition": "((`atulecarter_atul_demo1`.`prices`.`lower_limit` = 1) and (`atulecarter_atul_demo1`.`prices`.`usergroup_id` in (0,0,1)))",
                "cost_info": {
                  "read_cost": "1.56",
                  "eval_cost": "0.01",
                  "prefix_cost": "44.10",
                  "data_read_per_join": "1"
                },
                "used_columns": [
                  "product_id",
                  "price",
                  "percentage_discount",
                  "lower_limit",
                  "usergroup_id"
                ],
                "attached_condition": "((`atulecarter_atul_demo1`.`prices`.`price` >= 0.00) and (`atulecarter_atul_demo1`.`prices`.`price` <= 0.00))"
              }
            },
            {
              "table": {
                "table_name": "prices_2",
                "access_type": "ref",
                "possible_keys": [
                  "usergroup",
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "key": "usergroup",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "atulecarter_atul_demo1.products_categories.product_id"
                ],
                "rows_examined_per_scan": 3,
                "rows_produced_per_join": 0,
                "filtered": "9.74",
                "not_exists": true,
                "cost_info": {
                  "read_cost": "0.15",
                  "eval_cost": "0.00",
                  "prefix_cost": "44.29",
                  "data_read_per_join": "0"
                },
                "used_columns": [
                  "product_id",
                  "price",
                  "lower_limit",
                  "usergroup_id"
                ],
                "attached_condition": "(<if>(found_match(prices_2), isnull(`atulecarter_atul_demo1`.`prices_2`.`price`), true) and <if>(is_not_null_compl(prices_2), ((`atulecarter_atul_demo1`.`prices_2`.`lower_limit` = 1) and (`atulecarter_atul_demo1`.`prices_2`.`price` < `atulecarter_atul_demo1`.`prices`.`price`) and (`atulecarter_atul_demo1`.`prices_2`.`usergroup_id` in (0,0,1))), true))"
              }
            },
            {
              "table": {
                "table_name": "descr1",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "product_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id",
                  "lang_code"
                ],
                "key_length": "9",
                "ref": [
                  "atulecarter_atul_demo1.products_categories.product_id",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 0,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "0.01",
                  "eval_cost": "0.00",
                  "prefix_cost": "44.30",
                  "data_read_per_join": "68"
                },
                "used_columns": [
                  "product_id",
                  "lang_code",
                  "product",
                  "full_description"
                ]
              }
            }
          ]
        }
      }
    }
  }
}

Result

product_id product company_name price product_ids product_types parent_product_ids product_type parent_product_id full_description
136 BlazBlue: Continuum Shift EXTEND CS-Cart 0.00000000 136 P 0 P 0 <p> <p>The Time of the AZURE is Here!</p> <p>&nbsp;</p> <p>Aksys Games, a publisher of interactive entertainment software, is proud to announce that the next installment in the hit fighting game series BlazBlue, BlazBlue: Continuum Shift EXTEND, will be coming to North America as a PlayStation&reg;Vita launch title! With the devious, all new playable character Relius Clover, new story scenarios, new gameplay modes, and competitively balanced action, BlazBlue: Continuum Shift EXTEND makes a grand return to home consoles and the new frontier!</p> <p>BlazBlue: Continuum Shift EXTEND Key Features:</p> <p>&nbsp;</p> <p>Enhanced Story Mode: Relive and rediscover the events that took place in BlazBlue: Calamity Trigger or venture forth into one of four all new story scenarios!</p> <p>New and Revised Game Modes to Explore: Take on the strongest of foes in Unlimited Mars Mode, dungeoneer your way to the bottom of Abyss Mode, or lead an army to victory in Legion Mode!</p> <p>Fully Revised Combat System: All characters, new and old, have been thoroughly rebalanced and armed with all new strategies and combos to take your game to the top!</p> <p>Improved Online Multiplayer: Battle it out in BlazBlue&rsquo;s acclaimed online mode with all new multiplayer features, such as online team battles!</p> <p>SHIP DATE: February 14, 2012</p> <p>GENRE: Fighting</p> <p>PLAYER(S): 1 Local, 2-6 Online</p> </p>
135 Creative ZEN Touch 2 MP3 Player 8GB (Black) CS-Cart 0.00000000 135,135 P,P 0,0 P 0 <p>The ZEN line of portable media players has long been associated with the highest quality in audio playback, and the Creative ZEN Touch 2 continues to uphold this standard. But that's not all it offers. What makes this player truly stand out from the rest is that you can stream music wirelessly to compatible Bluetooth&reg; headphones or speakers such as Creative's ZiiSound D5 and WP-300, and surf the Internet too.</p>
138 Ridge Racer CS-Cart 0.00000000 138 P 0 P 0 <p> <p>BEAUTY &amp; HIGH SPEED DRIFTING AROUND THE WORLD!</p> <p>The high-octane racing franchise drifts onto the PlayStation&reg;Vita delivering stunning graphics and heart-pounding action that players can truly feel. Ridge Racer&reg; features high-speed action, high-performance racing machines, and all-new gameplay additions creating an edge-of-your-seat experience only possible on the PlayStation&reg;Vita. Racing fans can also take the action online and tear up the track against players from around the globe using the PlayStation&reg;Vita &ldquo;near&rdquo; and Wi-Fi functionality and race against other players&rsquo; ghosts anywhere at anytime.</p> <p> <p>Vivid, next generation high-contrast graphics and advanced lighting effects powered by the PlayStation&reg;Vita painting processor</p> <p>An immersive audio experience with a dynamic soundscape that changes and evolves with each race according to the movement of your machine.</p> <p>All-new custom drift system enables players to tune the action to suit their style of driving. All new "Machine Upgrade Map" customization allows players to upgrade functional parts and create their own original machines</p> <p>New introduction of the Planetary League allows players to join in one of four racing teams and race against other players from around the world both at real-time and "anywhere at any time" by exchanging ghosts via "near" functionality.</p> <p>Compete against up to 7 other players from around the world with online (ad-hoc, Wi-Fi) multiplayer.</p> </p> </p>