Sandbox

SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  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_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 cscart_categories.category_id IN (236) 
  AND products.product_id NOT IN (69) 
  AND companies.status IN ('A') 
  AND (
    products.amount > 0 
    OR products.tracking = 'D'
  ) 
  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 products.parent_product_id = 0 
  AND products.company_id IN('1', '2', '3', '4', '5', '6') 
  AND products.product_type != 'D' 
GROUP BY 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 4

Query time 0.00134

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "6.10"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.20",
                "prefix_cost": "0.00",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ]
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id",
                "product_id"
              ],
              "key_length": "6",
              "rows_examined_per_scan": 5,
              "rows_produced_per_join": 3,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "1.05",
                "eval_cost": "0.60",
                "prefix_cost": "1.65",
                "data_read_per_join": "48"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ],
              "attached_condition": "((`atulecarter_atul_demo1`.`products_categories`.`category_id` = 236) and (`atulecarter_atul_demo1`.`products_categories`.`product_id` <> 69))"
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "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": "17.03",
              "cost_info": {
                "read_cost": "3.00",
                "eval_cost": "0.10",
                "prefix_cost": "5.25",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "amount",
                "usergroup_ids",
                "tracking",
                "parent_product_id"
              ],
              "attached_condition": "((`atulecarter_atul_demo1`.`products`.`parent_product_id` = 0) and ((`atulecarter_atul_demo1`.`products`.`amount` > 0) or (`atulecarter_atul_demo1`.`products`.`tracking` = 'D')) 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`.`company_id` in ('1','2','3','4','5','6')) and (`atulecarter_atul_demo1`.`products`.`product_type` <> 'D'))"
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "atulecarter_atul_demo1.products.company_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "16.67",
              "cost_info": {
                "read_cost": "0.51",
                "eval_cost": "0.02",
                "prefix_cost": "5.87",
                "data_read_per_join": "613"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "(`atulecarter_atul_demo1`.`companies`.`status` = 'A')"
            }
          },
          {
            "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": "29.30",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.09",
                "eval_cost": "0.01",
                "prefix_cost": "6.01",
                "data_read_per_join": "1"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`atulecarter_atul_demo1`.`prices`.`lower_limit` = 1) and (`atulecarter_atul_demo1`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          },
          {
            "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": "0.07",
                "eval_cost": "0.01",
                "prefix_cost": "6.10",
                "data_read_per_join": "349"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product",
                "full_description"
              ]
            }
          }
        ]
      }
    }
  }
}

Result

product_id	product	company_name	product_type	full_description
71	DROID INCREDIBLE 2	CS-Cart	P	<p>Socialize with a sense of style<br /> The Droid Incredible 2 by HTC is ready to party. Its sleek, all-black design will get looks, and front and back cameras can help capture a scene, start a conversation, or snap a self-portrait. You can record the night's most memorable moments in 720p HD video for sharing later.<br /><br />A phone that's designed around you<br /> HTC Sense™ lets you do more in fewer steps with a friendly experience that brings everything you care about right to the surface. You can easily make your phone your own and put everything exactly where you want it. FriendStream™ pulls together all your friends' Twitter,™ Facebook,® and Flickr® updates in one place. Here's an idea: Choose a People widget that lets you see everybody's latest updates and messages right on the home screen. You can also select a compact People widget that just shows their profile pictures.<br /><br />Worth watching — and listening to<br /> Your music and movies look and sound great on a 4-inch super LCD screen with SRS WOW™ HD surround sound. Get access to unlimited songs through V CAST™ Music with Rhapsody or tune in to the expert DJs on Slacker® Internet Radio. V CAST Video on Demand gives you on-the-go access to more shows and movies, including those available from BLOCKBUSTER On Demand.®<br /><br />Invite friends to your own private Hotspot<br /> Your phone turns into a 3G Mobile Hotspot, for up to five other Wi-Fi®–enabled devices. That just might make you more popular than ever.<br /><br />Call anyone, anywhere — no matter where you travel<br /> The global-ready Droid Incredible 2 by HTC will keep you connected from Lima to London.</p>
70	EVO Design 4G	CS-Cart	P	<p>The HTC EVO Design 4G is a high-end smartphone that is packed full of the latest features! Powered by Android 2.3, this device comes pre-loaded with the newest Android Platform for smartphones. You can choose from thousands of apps and games at the Android Marketplace. The HTC EVO Design 4G also comes loaded with a 4.0” qHD capacitive touch display, with the latest version of HTC Sense, and international phone capabilities. With a 5 megapixel main camera, you will have the ability to capture, record and playback in HD. This smartphone also features a 1.3 megapixel front-facing camera for video chats! Quickly download movies and create user generated content with a flash-enabled web browsing experience running on Sprint's 4G network and the power of a 1.2 GHz processor.</p>
67	HTC Wildfire S - White (T-Mobile)	CS-Cart	P	<p>The HTC Wildfire S for T-Mobile is a 3G capable smartphone that adds style to a practical device. This sleek device runs on the Android™ 2.3 platform, so you can have the latest Android™ technology and access to thousands of apps. It also features a 3.2 inch capacitive touchscreen, a 5 megapixel camera for capturing important moments and Wi-Fi calling/hotspot capabilities! Weighing only 3.7 ounces, the Wildfire S is extremely portable. If you are looking for a stylish and fun smartphone that is easy to use, the HTC Wildfire S could be the phone for you!</p>
68	Titan	CS-Cart	P	<p>In the right hands, amazing things happen.<br /><br />Put emails in their place<br /> Combine your personal inboxes while keeping your work account separate.<br /><br />Plenty of room in the office<br /> Microsoft® Office Mobile and multitasking on a huge <br /> 4.7" screen makes plenty of room for work, wherever you go.<br /><br />Focus on thoughts, not thumbs<br /> With such a spacious keypad, you can stop focusing on your fingers and start focusing on ideas.<br /><br />Expansive display, infinite possibility<br /> Whether you’re taking care of business or taking a break from it all, you can see the big picture on the 4.7" LCD screen.<br /><br />Pocket-sized profile<br /> At 9.9mm, it’s slim enough to fit comfortably in your pocket. But considering everything the HTC TITAN with Windows Phone is capable of, it won’t be spending much time there.</p>