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 = 7170 
WHERE 
  cscart_products_categories.product_id IN (
    101143, 101144, 101145, 101146, 101147, 
    101148, 101149, 101150, 101151, 101152, 
    101153, 101154, 101155, 101156, 101157, 
    101158, 101159, 101160, 101161, 101162, 
    101163, 101164, 101165, 101166, 101167, 
    101168, 101169, 101170, 101171, 101172, 
    101173, 101174, 101175, 101176, 101177, 
    101178, 101179, 101180, 101181, 101182, 
    101183, 101184, 101185, 101186, 101187, 
    101188, 101189, 101190, 101191, 101192, 
    101193, 101194, 101195, 101196, 101197, 
    101198, 101199, 101200, 101201, 101202, 
    101203, 101204, 101205, 101206, 101207, 
    101208, 101209, 101210, 101211, 101212, 
    101213, 101214, 101215, 101216, 101217, 
    101218, 101219, 101220, 101221, 101222, 
    101223, 101224, 101225, 101226, 101227, 
    101228, 101229, 101230, 101231, 101232, 
    101233, 101234, 101235, 101236, 101237, 
    101238
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00243

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 (101143,101144,101145,101146,101147,101148,101149,101150,101151,101152,101153,101154,101155,101156,101157,101158,101159,101160,101161,101162,101163,101164,101165,101166,101167,101168,101169,101170,101171,101172,101173,101174,101175,101176,101177,101178,101179,101180,101181,101182,101183,101184,101185,101186,101187,101188,101189,101190,101191,101192,101193,101194,101195,101196,101197,101198,101199,101200,101201,101202,101203,101204,101205,101206,101207,101208,101209,101210,101211,101212,101213,101214,101215,101216,101217,101218,101219,101220,101221,101222,101223,101224,101225,101226,101227,101228,101229,101230,101231,101232,101233,101234,101235,101236,101237,101238))"
          }
        },
        {
          "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"
            ]
          }
        }
      ]
    }
  }
}