SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    3660, 3649, 3733, 3740, 3743, 3944, 3741, 
    3811, 3441, 3946, 3768, 3734, 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
  ) 
  AND cscart_product_descriptions.lang_code = 'ar'

Query time 0.00229

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "66.56"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 94,
      "rows_produced_per_join": 94,
      "filtered": "100.00",
      "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`product_id` in (3660,3649,3733,3740,3743,3944,3741,3811,3441,3946,3768,3734,3747,3641,3952,3738,3435,3798,3443,3730,3737,3638,3655,3729,3658,3851,3668,3942,3732,3448,3702,3728,3852,3850,3731,3769,3642,3745,3943,3623,3670,3684,3645,3437,3637,3682,3767,3950,3644,3659,3766,3864,3940,3436,3739,3444,3785,3442,3787,3945,3438,3770,3865,3447,3793,3450,3772,3795,3788,3439,3446,3687,3860,3794,3858,3869,3948,3449,3941,3871,3786,3853,3857,3863,3867,3951,3862,3854,3949,3727,3699,3881,3855,3859)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`lang_code` = 'ar'))",
      "cost_info": {
        "read_cost": "57.16",
        "eval_cost": "9.40",
        "prefix_cost": "66.56",
        "data_read_per_join": "428K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}