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 (
    8322, 8324, 8323, 8325, 8326, 8327, 8328, 
    8329, 8332, 8645, 7546, 7547, 7548, 
    7545, 7665, 7556, 7667, 7661, 7508, 
    7929, 9730, 7925, 7928, 7927, 8065, 
    7926, 7930, 8647, 8635, 8637, 8638, 
    8641, 8636, 8639
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "24.08"
    },
    "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": 34,
      "rows_produced_per_join": 34,
      "filtered": "100.00",
      "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`product_id` in (8322,8324,8323,8325,8326,8327,8328,8329,8332,8645,7546,7547,7548,7545,7665,7556,7667,7661,7508,7929,9730,7925,7928,7927,8065,7926,7930,8647,8635,8637,8638,8641,8636,8639)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "20.68",
        "eval_cost": "3.40",
        "prefix_cost": "24.08",
        "data_read_per_join": "155K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}