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 (
    98393, 98394, 98395, 98396, 98397, 98398, 
    98399, 98400, 98401, 98402, 98403, 
    98404, 98405, 98406, 98411, 98412, 
    98413, 98421, 98422, 98424, 98425, 
    98426, 98427, 98428, 98429, 98432, 
    98433, 98434, 98435, 98436, 98437, 
    98438, 98439, 98440, 98441, 98442, 
    98443, 98446, 98447, 98449, 98450, 
    98451, 98452, 98453, 98455, 98456, 
    98476, 98477, 98478, 98479, 98480, 
    98481, 98483, 98484, 98485, 98486, 
    98487, 98488, 98489, 98490, 98491, 
    98492, 98493, 98494, 98495, 98503, 
    98504, 98505, 98506, 98507, 98508, 
    98759, 98769, 98770, 98771, 98772, 
    98897, 99066, 99508, 99509, 99510, 
    99512, 99513, 99514, 99516, 99517, 
    99518, 100480, 100481, 100484, 100485, 
    100486, 100700, 100701, 100702, 100703
  )

Query time 0.00047

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 (98393,98394,98395,98396,98397,98398,98399,98400,98401,98402,98403,98404,98405,98406,98411,98412,98413,98421,98422,98424,98425,98426,98427,98428,98429,98432,98433,98434,98435,98436,98437,98438,98439,98440,98441,98442,98443,98446,98447,98449,98450,98451,98452,98453,98455,98456,98476,98477,98478,98479,98480,98481,98483,98484,98485,98486,98487,98488,98489,98490,98491,98492,98493,98494,98495,98503,98504,98505,98506,98507,98508,98759,98769,98770,98771,98772,98897,99066,99508,99509,99510,99512,99513,99514,99516,99517,99518,100480,100481,100484,100485,100486,100700,100701,100702,100703))",
          "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"
          ]
        }
      }
    ]
  }
}