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 (
    3826, 3660, 3649, 3733, 3740, 3743, 3944, 
    3741, 3811, 3441, 3653, 3946, 3768, 
    3734, 3821, 3747, 3641, 3952, 3738, 
    3435, 3798, 3443, 3730, 3737, 3638, 
    3655, 3729, 3658, 3851, 3668, 3942, 
    3732, 3448, 3702, 3728, 3852, 3850, 
    3731, 3769, 3642, 3745, 3943, 3623, 
    3670, 3684, 3645, 3437, 3637, 3682, 
    3767, 3950, 3644, 3659, 3766, 3864, 
    3940, 3436, 3739, 3444, 3785, 3442, 
    3787, 3945, 3438, 3770, 3865, 3447, 
    3793, 3450, 3772, 3795, 3788, 3439, 
    3446, 3687, 3860, 3794, 3858, 3869, 
    3948, 3449, 3941, 3871, 3786, 3853, 
    3857, 3863, 3867, 3951, 3862, 3854, 
    3949, 3727, 3699, 3881, 3855, 3859
  )

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "135.81"
    },
    "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": 97,
          "rows_produced_per_join": 97,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`p`.`product_id` in (3826,3660,3649,3733,3740,3743,3944,3741,3811,3441,3653,3946,3768,3734,3821,3747,3641,3952,3738,3435,3798,3443,3730,3737,3638,3655,3729,3658,3851,3668,3942,3732,3448,3702,3728,3852,3850,3731,3769,3642,3745,3943,3623,3670,3684,3645,3437,3637,3682,3767,3950,3644,3659,3766,3864,3940,3436,3739,3444,3785,3442,3787,3945,3438,3770,3865,3447,3793,3450,3772,3795,3788,3439,3446,3687,3860,3794,3858,3869,3948,3449,3941,3871,3786,3853,3857,3863,3867,3951,3862,3854,3949,3727,3699,3881,3855,3859))",
          "cost_info": {
            "read_cost": "58.21",
            "eval_cost": "9.70",
            "prefix_cost": "67.91",
            "data_read_per_join": "1K"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 97,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "24.25",
            "eval_cost": "9.70",
            "prefix_cost": "101.86",
            "data_read_per_join": "37K"
          },
          "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": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 97,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "24.25",
            "eval_cost": "9.70",
            "prefix_cost": "135.81",
            "data_read_per_join": "9K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}