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 (
    94068, 94069, 94070, 94071, 94072, 94076, 
    94077, 94078, 94079, 94449, 94686, 
    94687, 94688, 94689, 94690, 94691, 
    94692, 94693, 94694, 94695, 94696, 
    94697, 94698, 94699, 94700, 94701, 
    94702, 94703, 94704, 94705, 94706, 
    94707, 94708, 94710, 94711, 94712, 
    94713, 94714, 94715, 94716, 96295, 
    96296, 96297, 96298, 96299, 96300, 
    96301, 96302
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00052

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 (94068,94069,94070,94071,94072,94076,94077,94078,94079,94449,94686,94687,94688,94689,94690,94691,94692,94693,94694,94695,94696,94697,94698,94699,94700,94701,94702,94703,94704,94705,94706,94707,94708,94710,94711,94712,94713,94714,94715,94716,96295,96296,96297,96298,96299,96300,96301,96302)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}