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 = 7195 
WHERE 
  cscart_products_categories.product_id IN (
    93787, 93788, 93798, 93799, 93800, 93801, 
    93802, 93803, 93804, 93805, 93806, 
    93807, 93808, 93809, 93810, 93811, 
    93812, 93813, 93814, 93815, 93816, 
    93817, 93818, 93832, 93833, 93834, 
    93835, 93836, 93837, 93838, 93839, 
    93840, 93841, 93882, 93883, 93884, 
    93885, 94367, 94368, 94369, 94370, 
    94371, 94372, 94373, 94374, 94375, 
    94376, 94377, 94378, 94379, 94380, 
    94438, 94463, 94464, 94465, 94466, 
    94467, 94468, 94469, 94470, 94471, 
    94472, 94473, 94474, 94475, 94476, 
    94477, 94478, 94479, 94480, 94481, 
    94482, 94483, 94589, 94590, 94591, 
    94811, 94812, 94820, 94821, 94959, 
    94960, 94961, 94962, 94963, 94964, 
    95360, 95394, 95395, 95396, 95397, 
    95398, 95399, 95400, 95401, 95424
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.01607

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "102.90"
    },
    "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": 114,
            "rows_produced_per_join": 114,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "11.70",
              "eval_cost": "11.40",
              "prefix_cost": "23.10",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (93787,93788,93798,93799,93800,93801,93802,93803,93804,93805,93806,93807,93808,93809,93810,93811,93812,93813,93814,93815,93816,93817,93818,93832,93833,93834,93835,93836,93837,93838,93839,93840,93841,93882,93883,93884,93885,94367,94368,94369,94370,94371,94372,94373,94374,94375,94376,94377,94378,94379,94380,94438,94463,94464,94465,94466,94467,94468,94469,94470,94471,94472,94473,94474,94475,94476,94477,94478,94479,94480,94481,94482,94483,94589,94590,94591,94811,94812,94820,94821,94959,94960,94961,94962,94963,94964,95360,95394,95395,95396,95397,95398,95399,95400,95401,95424))"
          }
        },
        {
          "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": 114,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "28.50",
              "eval_cost": "11.40",
              "prefix_cost": "63.00",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        },
        {
          "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": 5,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "28.50",
              "eval_cost": "0.57",
              "prefix_cost": "102.90",
              "data_read_per_join": "14K"
            },
            "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')))"
          }
        }
      ]
    }
  }
}