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 (
    3354, 3834, 3308, 3306, 3841, 3212, 3226, 
    3350, 3218, 3392, 3301, 3751, 3828, 
    3520, 3529, 3809, 3518, 3918, 3215, 
    3213, 3597, 3752, 3552, 3836, 3232, 
    3589, 3556, 3845, 3822, 3370, 3843, 
    3840, 3882, 3377, 3373, 3593, 3551, 
    3831, 3519, 3919, 3356, 3404, 3366, 
    3222, 3522, 3401, 3358, 3537, 3291, 
    3225, 3844, 3876, 3559, 3917, 3528, 
    3819, 3922, 3534, 3531, 3812, 3372, 
    3374, 3309, 3590, 3351, 3532, 3546, 
    3827, 3548, 3521, 3355, 3398, 3357, 
    3369, 3807, 3525, 3408, 3746, 3393, 
    3744
  ) 
  AND cscart_product_descriptions.lang_code = 'ar'

Query time 0.00233

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "56.65"
    },
    "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": 80,
      "rows_produced_per_join": 80,
      "filtered": "100.00",
      "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`product_id` in (3354,3834,3308,3306,3841,3212,3226,3350,3218,3392,3301,3751,3828,3520,3529,3809,3518,3918,3215,3213,3597,3752,3552,3836,3232,3589,3556,3845,3822,3370,3843,3840,3882,3377,3373,3593,3551,3831,3519,3919,3356,3404,3366,3222,3522,3401,3358,3537,3291,3225,3844,3876,3559,3917,3528,3819,3922,3534,3531,3812,3372,3374,3309,3590,3351,3532,3546,3827,3548,3521,3355,3398,3357,3369,3807,3525,3408,3746,3393,3744)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`lang_code` = 'ar'))",
      "cost_info": {
        "read_cost": "48.65",
        "eval_cost": "8.00",
        "prefix_cost": "56.65",
        "data_read_per_join": "365K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}