SELECT 
  cscart_products_categories.product_id, 
  GROUP_CONCAT(
    IF(
      cscart_products_categories.link_type = "M", 
      CONCAT(
        cscart_products_categories.category_id, 
        "M"
      ), 
      cscart_products_categories.category_id
    )
  ) AS category_ids, 
  product_position_source.position AS position 
FROM 
  cscart_products_categories 
  INNER JOIN cscart_categories ON cscart_categories.category_id = cscart_products_categories.category_id 
  AND cscart_categories.storefront_id IN (0, 1) 
  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_products_categories AS product_position_source ON cscart_products_categories.product_id = product_position_source.product_id 
  AND product_position_source.category_id = 7254 
WHERE 
  cscart_products_categories.product_id IN (
    97252, 97253, 97254, 97255, 97256, 97257, 
    97258, 97259, 97260, 97261, 97262, 
    97263, 97264, 97265, 97266, 97267, 
    97268, 97269, 97270, 97271, 97272, 
    97273, 97274, 97275, 97276, 97277, 
    97278, 97279, 97280, 97281, 97282, 
    97283, 97284, 97285, 97286, 97287, 
    97288, 97289, 97290, 97291, 97292, 
    97293, 97294, 97295, 97296, 97297, 
    97298, 97299, 97300, 97301, 97302, 
    97303, 97304, 97305, 97306, 97307, 
    97308, 97309, 97310, 97311, 97312, 
    97313, 97314, 97315, 97316, 97317, 
    97318, 97319, 97320, 97321, 97322, 
    97323, 97324, 97325, 97326, 97327, 
    97328, 97329, 97330, 97331, 97332, 
    97333, 97334, 97335, 97336, 97337, 
    97338, 97339, 97340, 97341, 97342, 
    97343, 97344, 97345, 97346, 97347
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00228

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "54.77"
    },
    "grouping_operation": {
      "using_filesort": false,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_products_categories",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "link_type",
              "pt"
            ],
            "key": "pt",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 96,
            "rows_produced_per_join": 96,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "9.89",
              "eval_cost": "9.60",
              "prefix_cost": "19.49",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (97252,97253,97254,97255,97256,97257,97258,97259,97260,97261,97262,97263,97264,97265,97266,97267,97268,97269,97270,97271,97272,97273,97274,97275,97276,97277,97278,97279,97280,97281,97282,97283,97284,97285,97286,97287,97288,97289,97290,97291,97292,97293,97294,97295,97296,97297,97298,97299,97300,97301,97302,97303,97304,97305,97306,97307,97308,97309,97310,97311,97312,97313,97314,97315,97316,97317,97318,97319,97320,97321,97322,97323,97324,97325,97326,97327,97328,97329,97330,97331,97332,97333,97334,97335,97336,97337,97338,97339,97340,97341,97342,97343,97344,97345,97346,97347))"
          }
        },
        {
          "table": {
            "table_name": "cscart_categories",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "c_status",
              "p_category_id"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id"
            ],
            "key_length": "3",
            "ref": [
              "nuie_scalesta_net.cscart_products_categories.category_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 4,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "24.00",
              "eval_cost": "0.48",
              "prefix_cost": "53.09",
              "data_read_per_join": "12K"
            },
            "used_columns": [
              "category_id",
              "usergroup_ids",
              "status",
              "storefront_id"
            ],
            "attached_condition": "((`nuie_scalesta_net`.`cscart_categories`.`storefront_id` in (0,1)) and ((`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`))) and (`nuie_scalesta_net`.`cscart_categories`.`status` in ('A','H')))"
          }
        },
        {
          "table": {
            "table_name": "product_position_source",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "pt"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id",
              "product_id"
            ],
            "key_length": "6",
            "ref": [
              "const",
              "nuie_scalesta_net.cscart_products_categories.product_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 4,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.20",
              "eval_cost": "0.48",
              "prefix_cost": "54.77",
              "data_read_per_join": "76"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        }
      ]
    }
  }
}