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 
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 (
    166, 174, 175, 176, 177, 178, 179, 180, 
    181, 182, 199, 185, 186, 187, 188, 189, 
    190, 191, 194, 193, 195, 196, 197, 198, 
    200, 202, 234, 235, 236, 237, 238, 240, 
    254, 255, 263
  ) 
  AND companies.status IN ('A') 
  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') 
  AND products.product_type != 'D' 
GROUP BY 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  48, 48

Query time 0.00294

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "30.90"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "companies",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 1,
              "filtered": "50.00",
              "index_condition": "(`atulecarter_atul_demo4`.`companies`.`company_id` in ('1','2'))",
              "cost_info": {
                "read_cost": "4.61",
                "eval_cost": "0.20",
                "prefix_cost": "4.81",
                "data_read_per_join": "8K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "(`atulecarter_atul_demo4`.`companies`.`status` = 'A')"
            }
          },
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "ALL",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "rows_examined_per_scan": 84,
              "rows_produced_per_join": 1,
              "filtered": "1.67",
              "using_join_buffer": "Block Nested Loop",
              "cost_info": {
                "read_cost": "20.06",
                "eval_cost": "0.28",
                "prefix_cost": "25.15",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "((`atulecarter_atul_demo4`.`cscart_categories`.`category_id` in (166,174,175,176,177,178,179,180,181,182,199,185,186,187,188,189,190,191,194,193,195,196,197,198,200,202,234,235,236,237,238,240,254,255,263)) and ((`atulecarter_atul_demo4`.`cscart_categories`.`usergroup_ids` = '') or find_in_set(0,`atulecarter_atul_demo4`.`cscart_categories`.`usergroup_ids`) or find_in_set(1,`atulecarter_atul_demo4`.`cscart_categories`.`usergroup_ids`)) and (`atulecarter_atul_demo4`.`cscart_categories`.`status` in ('A','H')) and (`atulecarter_atul_demo4`.`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_demo4.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 2,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "1.46",
                "eval_cost": "0.56",
                "prefix_cost": "27.17",
                "data_read_per_join": "44"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "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_demo4.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "2.80",
                "eval_cost": "0.03",
                "prefix_cost": "30.53",
                "data_read_per_join": "686"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "usergroup_ids",
                "parent_product_id"
              ],
              "attached_condition": "((`atulecarter_atul_demo4`.`products`.`company_id` = `atulecarter_atul_demo4`.`companies`.`company_id`) and (`atulecarter_atul_demo4`.`products`.`parent_product_id` = 0) and ((`atulecarter_atul_demo4`.`products`.`usergroup_ids` = '') or find_in_set(0,`atulecarter_atul_demo4`.`products`.`usergroup_ids`) or find_in_set(1,`atulecarter_atul_demo4`.`products`.`usergroup_ids`)) and (`atulecarter_atul_demo4`.`products`.`status` = 'A') and (`atulecarter_atul_demo4`.`products`.`product_type` <> 'D'))"
            }
          },
          {
            "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_demo4.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.14",
                "eval_cost": "0.03",
                "prefix_cost": "30.70",
                "data_read_per_join": "654"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "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_demo4.products_categories.product_id"
              ],
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 0,
              "filtered": "96.52",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.15",
                "eval_cost": "0.05",
                "prefix_cost": "30.90",
                "data_read_per_join": "6"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`atulecarter_atul_demo4`.`prices`.`lower_limit` = 1) and (`atulecarter_atul_demo4`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          }
        ]
      }
    }
  }
}

Result

product_id	product	company_name	product_type
154	JR900 Wireless Headphones	CS-Cart	P
53	KFC-W3012	CS-Cart	P
52	KFC-W3013PS	CS-Cart	P
161	MV800 16.1 Megapixel MultiView Compact Digital Camera	CS-Cart	P
165	Nikon 1 J1 One-Lens Kit White	CS-Cart	P
166	Nikon 1 J1 Two-Lens Wide Angle Kit Red	CS-Cart	P
86	Nokia 700	CS-Cart	P
106	Nokia E5-00	CS-Cart	P
105	Nokia Lumia 800	CS-Cart	P
101	Nokia X3-02	CS-Cart	P
33	nüvi® 2455LT	CS-Cart	P
32	nüvi® 3450	CS-Cart	P
163	NX200 20.3 Megapixel Compact System Camera	CS-Cart	P
155	Porta Pro KTC On-Ear Headphone	CS-Cart	P
55	PRS-D800	CS-Cart	P
69	Rhyme	CS-Cart	P
184	Samsung 30mm NX Pancake Lens	CS-Cart	P
183	Samsung 50-200mm NX Telephoto OIS Lens	CS-Cart	P
133	Samsung Galaxy Player 4.0	CS-Cart	P
132	Samsung Galaxy Player 5.0	CS-Cart	P
125	Samsung Galaxy S II	CS-Cart	P
120	Samsung Galaxy S II, Epic 4G Touch (Black)	CS-Cart	P
146	Sansa Clip+ MP3 Player (Blue) - 4GB	CS-Cart	P
147	Sansa Clip+ MP3 Player (Red) - 4GB	CS-Cart	P
145	Sansa Fuze+ MP3 Player (Red) - 4GB	ACME Corp	P
117	SCH-I515	CS-Cart	P
113	SGH-I677	CS-Cart	P
157	Studio Monitor Headphones	CS-Cart	P
68	Titan	CS-Cart	P
29	TomTom GO LIVE Top Gear edition	CS-Cart	P
6	Toshiba 32C120U 32" Class 720P HD LCD TV	CS-Cart	P
8	Toshiba 32TL515U 32" Class 1080P 3D LED HD TV	CS-Cart	P
14	Toshiba 40E220U 40" Class 1080P HD LCD TV	CS-Cart	P
9	Toshiba 42TL515U 42" Class 1080P 3D LED HD TV	CS-Cart	P
10	Toshiba 47TL515U 47" Class 1080P 3D LED HD TV	CS-Cart	P
19	Toshiba BDX2150 Blu-ray Player	CS-Cart	P
21	Toshiba SD3300 DVD Player	CS-Cart	P
50	TS-D1720C	CS-Cart	P
51	TS-D6902R	CS-Cart	P
49	TS-MR1640	CS-Cart	P
48	TS-MR2040	CS-Cart	P
54	TS-W3002D2\|D4	CS-Cart	P
153	UR55 Full Size Headphones	CS-Cart	P
164	WB210 10MB 14 Megapixel Slim Digital Camera (Red)	CS-Cart	P
248	X-Box One	CS-Cart	P
65	XRS 9370	CS-Cart	P
64	XRS 9745	CS-Cart	P
63	XRS 9770	CS-Cart	P