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 (
    100442, 100443, 100444, 100445, 100446, 
    100447, 100448, 100449, 100450, 100451, 
    100452, 100453, 100454, 100455, 100456, 
    100457, 100458, 100459, 100460, 100461, 
    100462, 100463, 100464, 100465, 100466, 
    100467, 100468, 100469, 100470, 100471, 
    100472, 100473, 100474, 100475, 100476, 
    100923, 100924, 100925, 100926, 100927, 
    100928, 100929, 100930, 100931, 100932, 
    100933, 100934, 100935, 100936, 100937, 
    100938, 100939, 100940, 100941, 100942, 
    100943, 100944, 100945, 100946, 100947, 
    100948, 100949, 100950, 100951, 100952, 
    100953, 100954, 100955, 100956, 100957, 
    100958, 100959, 100960, 100961, 100962, 
    100963, 100964, 100965, 100966, 100967, 
    100968, 100969, 100970, 100971, 100972, 
    100973, 100974, 100975, 100976, 100977, 
    100978, 100979, 100980, 100981, 100982, 
    100983
  )

Query time 0.00075

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 (100442,100443,100444,100445,100446,100447,100448,100449,100450,100451,100452,100453,100454,100455,100456,100457,100458,100459,100460,100461,100462,100463,100464,100465,100466,100467,100468,100469,100470,100471,100472,100473,100474,100475,100476,100923,100924,100925,100926,100927,100928,100929,100930,100931,100932,100933,100934,100935,100936,100937,100938,100939,100940,100941,100942,100943,100944,100945,100946,100947,100948,100949,100950,100951,100952,100953,100954,100955,100956,100957,100958,100959,100960,100961,100962,100963,100964,100965,100966,100967,100968,100969,100970,100971,100972,100973,100974,100975,100976,100977,100978,100979,100980,100981,100982,100983))",
          "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"
          ]
        }
      }
    ]
  }
}