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 (
    98453, 98455, 98456, 98476, 98477, 98478, 
    98479, 98480, 98481, 98482, 98483, 
    98484, 98485, 98486, 98487, 98488, 
    98489, 98490, 98491, 98492, 98493, 
    98494, 98495, 98503, 98504, 98505, 
    98506, 98507, 98508, 98523, 98524, 
    98525, 98526, 98527, 98528, 98529, 
    98530, 98531, 98532, 98533, 98534, 
    98535, 98536, 98537, 98538, 98539, 
    98540, 98541, 98542, 98543, 98544, 
    98545, 98546, 98547, 98548, 98549, 
    98557, 98558, 98559, 98563, 98564, 
    98565, 98566, 98567, 98568, 98569, 
    98690, 98693, 98694, 98758, 98759, 
    98762, 98769, 98770, 98771, 98772, 
    98773, 98774, 98775, 98776, 98777, 
    98778, 98779, 98780, 98781, 98782, 
    98783, 98784, 98785, 98786, 98787, 
    98788, 98789, 98790, 98791, 98792
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00108

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.24"
    },
    "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": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "33.64",
        "eval_cost": "9.60",
        "prefix_cost": "43.24",
        "data_read_per_join": "366K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (98453,98455,98456,98476,98477,98478,98479,98480,98481,98482,98483,98484,98485,98486,98487,98488,98489,98490,98491,98492,98493,98494,98495,98503,98504,98505,98506,98507,98508,98523,98524,98525,98526,98527,98528,98529,98530,98531,98532,98533,98534,98535,98536,98537,98538,98539,98540,98541,98542,98543,98544,98545,98546,98547,98548,98549,98557,98558,98559,98563,98564,98565,98566,98567,98568,98569,98690,98693,98694,98758,98759,98762,98769,98770,98771,98772,98773,98774,98775,98776,98777,98778,98779,98780,98781,98782,98783,98784,98785,98786,98787,98788,98789,98790,98791,98792)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}