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 (
    414502, 424699, 381632, 431672, 414375, 
    393012, 396068, 393013, 427473, 366897, 
    392222, 414480, 434596, 414400, 391702, 
    387084, 434591, 434595, 435213, 434592, 
    414498, 434594, 434593, 414414, 432460, 
    432542, 432589, 432449, 432642, 432668, 
    432523, 432652, 432688, 432694
  )

Query time 0.00247

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "146.27"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 34,
          "rows_produced_per_join": 34,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "40.85",
            "eval_cost": "6.80",
            "prefix_cost": "47.65",
            "data_read_per_join": "544"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ],
          "attached_condition": "(`webmarco`.`p`.`product_id` in (414502,424699,381632,431672,414375,393012,396068,393013,427473,366897,392222,414480,434596,414400,391702,387084,434591,434595,435213,434592,414498,434594,434593,414414,432460,432542,432589,432449,432642,432668,432523,432652,432688,432694))"
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "webmarco.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 34,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "34.00",
            "eval_cost": "6.80",
            "prefix_cost": "88.45",
            "data_read_per_join": "13K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": [
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "webmarco.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 48,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "48.18",
            "eval_cost": "9.64",
            "prefix_cost": "146.27",
            "data_read_per_join": "4K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}