SELECT 
  category_id, 
  parent_id 
FROM 
  cscart_categories 
WHERE 
  parent_id IN(
    3761, 5602, 3658, 3924, 3772, 4233, 5940, 
    5299, 6217, 4124, 4559, 3964, 3897, 
    6834, 3878, 5490, 6800, 4831, 7676, 
    6399, 5311, 7319, 3796, 3659, 3905, 
    5653, 3778, 6335, 6019, 5450, 4676, 
    4281, 6913, 3890, 3938, 6923, 4922, 
    5534, 4284, 7642, 5373, 6526, 3660, 
    6456, 3807, 5491, 4341, 4760, 3949, 
    6984, 3786, 6070, 5581, 5055, 5440, 
    6551, 3664, 7068, 3816, 4486, 4853, 
    5550, 5638, 5190, 3669, 7262, 3824, 
    5152, 5042, 5718, 5683, 5258, 7327, 
    3832, 5222, 5729, 7580, 3839, 5808, 
    7658, 3857, 5906, 7733, 6010, 7779, 
    6110, 7828, 6247, 7904, 6659, 7085, 
    7223, 3550, 3573, 3595, 3600, 3605, 
    3608, 3616, 3623, 3628, 3634, 3642, 
    3651, 3666, 3673, 4310, 3685, 4726, 
    3693, 3702, 3712, 3726, 3735, 3742, 
    3751, 3869, 3913, 5831, 6678
  )

Query time 0.00146

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "77.95"
    },
    "table": {
      "table_name": "cscart_categories",
      "access_type": "range",
      "possible_keys": [
        "parent"
      ],
      "key": "parent",
      "used_key_parts": [
        "parent_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 192,
      "rows_produced_per_join": 192,
      "filtered": "100.00",
      "using_index": true,
      "cost_info": {
        "read_cost": "39.55",
        "eval_cost": "38.40",
        "prefix_cost": "77.95",
        "data_read_per_join": "1M"
      },
      "used_columns": [
        "category_id",
        "parent_id"
      ],
      "attached_condition": "(`webmarco`.`cscart_categories`.`parent_id` in (3761,5602,3658,3924,3772,4233,5940,5299,6217,4124,4559,3964,3897,6834,3878,5490,6800,4831,7676,6399,5311,7319,3796,3659,3905,5653,3778,6335,6019,5450,4676,4281,6913,3890,3938,6923,4922,5534,4284,7642,5373,6526,3660,6456,3807,5491,4341,4760,3949,6984,3786,6070,5581,5055,5440,6551,3664,7068,3816,4486,4853,5550,5638,5190,3669,7262,3824,5152,5042,5718,5683,5258,7327,3832,5222,5729,7580,3839,5808,7658,3857,5906,7733,6010,7779,6110,7828,6247,7904,6659,7085,7223,3550,3573,3595,3600,3605,3608,3616,3623,3628,3634,3642,3651,3666,3673,4310,3685,4726,3693,3702,3712,3726,3735,3742,3751,3869,3913,5831,6678))"
    }
  }
}