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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    87276, 87275, 87274, 87269, 88526, 88759, 
    87187, 87204, 87221, 87229, 84767, 
    84780, 84789, 84762, 88556, 88557, 
    88664, 88711, 88396, 88525, 88524, 
    88555, 93749, 93830, 93850, 93851, 
    93852, 93853, 93854, 94595, 94596, 
    94597, 94598, 94599, 94600, 94601, 
    94602, 94603, 94641, 94642, 94643, 
    94644, 94645, 94646, 94647, 94648, 
    94649, 94651
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00095

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (87276,87275,87274,87269,88526,88759,87187,87204,87221,87229,84767,84780,84789,84762,88556,88557,88664,88711,88396,88525,88524,88555,93749,93830,93850,93851,93852,93853,93854,94595,94596,94597,94598,94599,94600,94601,94602,94603,94641,94642,94643,94644,94645,94646,94647,94648,94649,94651)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}