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 (
    5549, 5661, 5660, 5523, 5666, 5665, 5655, 
    5663, 5664, 5650, 5652, 5474, 5682, 
    5452, 5527, 5425, 5494, 5653, 5593, 
    5488, 5492, 5453, 5491, 9784, 5578, 
    5446, 5414, 5408, 5411, 5536, 5551, 
    5553, 5515, 5435, 5454, 5668, 5415, 
    5581, 5409, 5422
  ) 
  AND cscart_product_descriptions.lang_code = 'ar'

Query time 0.00140

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "28.33"
    },
    "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": 40,
      "rows_produced_per_join": 40,
      "filtered": "100.00",
      "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`product_id` in (5549,5661,5660,5523,5666,5665,5655,5663,5664,5650,5652,5474,5682,5452,5527,5425,5494,5653,5593,5488,5492,5453,5491,9784,5578,5446,5414,5408,5411,5536,5551,5553,5515,5435,5454,5668,5415,5581,5409,5422)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`lang_code` = 'ar'))",
      "cost_info": {
        "read_cost": "24.33",
        "eval_cost": "4.00",
        "prefix_cost": "28.33",
        "data_read_per_join": "182K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}