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 (
    5750, 7013, 5739, 5727, 944, 478, 985, 
    525, 2478, 10284, 2527, 2490, 1406, 
    508, 1266, 1428, 1263, 2471, 2576, 2620, 
    1256, 1319, 1273, 4526, 2502, 2473, 
    2565, 2580, 2550, 2599, 2503, 2602, 
    3049, 2540, 3046, 3053, 4767, 2685, 
    2623, 5037, 8398, 4744, 2499, 3055, 
    2581, 2631, 2519, 8399, 5053, 8397, 
    4789, 8395, 5027, 5045, 5051, 10140, 
    5048, 10222, 10228, 10435, 10395, 10233
  ) 
  AND cscart_product_descriptions.lang_code = 'ar'

Query time 0.00175

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.90"
    },
    "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": 62,
      "rows_produced_per_join": 62,
      "filtered": "100.00",
      "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`product_id` in (5750,7013,5739,5727,944,478,985,525,2478,10284,2527,2490,1406,508,1266,1428,1263,2471,2576,2620,1256,1319,1273,4526,2502,2473,2565,2580,2550,2599,2503,2602,3049,2540,3046,3053,4767,2685,2623,5037,8398,4744,2499,3055,2581,2631,2519,8399,5053,8397,4789,8395,5027,5045,5051,10140,5048,10222,10228,10435,10395,10233)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`lang_code` = 'ar'))",
      "cost_info": {
        "read_cost": "37.70",
        "eval_cost": "6.20",
        "prefix_cost": "43.90",
        "data_read_per_join": "282K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}