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 (
    96647, 96648, 96649, 96650, 96651, 96652, 
    96653, 96654, 96655, 96656, 96657, 
    96658, 96659, 96660, 96661, 96662, 
    96663, 96664, 96665, 96666, 96667, 
    96695, 96696, 96697, 97581, 97743, 
    97744, 97745, 97746, 97747, 97748, 
    97749, 97750, 97751, 97752, 97753, 
    97754, 97755, 97756, 97757, 97758, 
    97759, 97760, 97761, 97762, 97763, 
    97764, 97795
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00050

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 (96647,96648,96649,96650,96651,96652,96653,96654,96655,96656,96657,96658,96659,96660,96661,96662,96663,96664,96665,96666,96667,96695,96696,96697,97581,97743,97744,97745,97746,97747,97748,97749,97750,97751,97752,97753,97754,97755,97756,97757,97758,97759,97760,97761,97762,97763,97764,97795)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}