SELECT 
  products.company_id as variant_id, 
  companies.company as variant 
FROM 
  cscart_products as products 
  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') 
  LEFT JOIN cscart_product_review_prepared_data ON cscart_product_review_prepared_data.product_id = products.product_id 
  AND cscart_product_review_prepared_data.storefront_id = 0 
WHERE 
  1 = 1 
  AND companies.status = 'A' 
  AND products.company_id = 4 
  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 products.company_id = 4 
  AND (
    NOT FIND_IN_SET(0, blacklist) 
    OR blacklist IS NULL
  ) 
  AND products.product_type != 'D' 
GROUP BY 
  products.company_id 
ORDER BY 
  companies.company ASC

Query time 0.00122

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "companies",
      "access_type": "const",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "4",
      "used_key_parts": ["company_id"],
      "ref": ["const"],
      "rows": 1,
      "filtered": 100
    },
    "table": {
      "table_name": "cscart_categories",
      "access_type": "index",
      "possible_keys": ["PRIMARY", "c_status", "p_category_id"],
      "key": "c_status",
      "key_length": "909",
      "used_key_parts": ["usergroup_ids", "status", "parent_id"],
      "rows": 54,
      "filtered": 100,
      "attached_condition": "(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')",
      "using_index": true
    },
    "table": {
      "table_name": "products_categories",
      "access_type": "ref",
      "possible_keys": ["PRIMARY", "pt"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["category_id"],
      "ref": ["vietpom_dev.cscart_categories.category_id"],
      "rows": 2,
      "filtered": 100,
      "using_index": true
    },
    "table": {
      "table_name": "products",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY", "status", "product_id"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "ref": ["vietpom_dev.products_categories.product_id"],
      "rows": 1,
      "filtered": 81.30841064,
      "attached_condition": "products.company_id = 4 and (products.usergroup_ids = '' or find_in_set(0,products.usergroup_ids) or find_in_set(1,products.usergroup_ids)) and products.`status` = 'A' and (!find_in_set(0,products.blacklist) or products.blacklist is null) and products.product_type <> 'D'"
    }
  }
}