SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    96857, 96858, 96859, 96860, 96861, 96862, 
    96863, 96864, 96865, 96866, 96867, 
    96868, 96869, 96870, 96871, 96872, 
    96873, 96874, 96875, 96876, 96877, 
    96878, 96879, 96880, 96881, 96882, 
    96883, 96884, 96885, 96886, 96887, 
    96888, 96889, 96890, 96891, 96892, 
    96893, 96894, 96895, 96896, 96897, 
    96898, 96899, 96900, 96901, 96902, 
    96903, 96904, 96905, 96906, 96907, 
    96908, 96909, 96910, 96911, 96912, 
    96913, 96914, 96915, 96916, 96917, 
    96918, 96919, 96920, 96921, 96922, 
    96923, 96924, 96925, 96926, 96927, 
    96928, 96929, 96930, 96931, 96932, 
    96933, 96934, 96935, 96936, 96937, 
    96938, 96939, 96940, 96941, 96942, 
    96943, 96944, 96945, 96946, 96947, 
    96948, 96949, 96950, 96951, 96952
  )

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.05"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "f",
          "access_type": "ALL",
          "possible_keys": [
            "idx_group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.35",
            "data_read_per_join": "104"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.70",
            "data_read_per_join": "400"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "index_condition": "(`nuie_scalesta_net`.`p`.`product_id` in (96857,96858,96859,96860,96861,96862,96863,96864,96865,96866,96867,96868,96869,96870,96871,96872,96873,96874,96875,96876,96877,96878,96879,96880,96881,96882,96883,96884,96885,96886,96887,96888,96889,96890,96891,96892,96893,96894,96895,96896,96897,96898,96899,96900,96901,96902,96903,96904,96905,96906,96907,96908,96909,96910,96911,96912,96913,96914,96915,96916,96917,96918,96919,96920,96921,96922,96923,96924,96925,96926,96927,96928,96929,96930,96931,96932,96933,96934,96935,96936,96937,96938,96939,96940,96941,96942,96943,96944,96945,96946,96947,96948,96949,96950,96951,96952))",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "1.05",
            "data_read_per_join": "16"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      }
    ]
  }
}