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 (
    98320, 98321, 98482, 98572, 98573, 98574, 
    98575, 98576, 98577, 98578, 98579, 
    98580, 98581, 98582, 98583, 98584, 
    98585, 98586, 98690, 98693, 98694, 
    98758, 99561, 100374, 100375, 100376, 
    100377, 100378, 100379, 100380, 100381, 
    100382, 100383, 100598, 100601, 101635, 
    101636, 101639, 101640, 101641, 101642, 
    101643, 101644, 101645, 101646, 101647, 
    101648, 101649, 101650, 101651, 101652, 
    101653
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00153

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "23.43"
    },
    "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": 52,
      "rows_produced_per_join": 52,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "18.23",
        "eval_cost": "5.20",
        "prefix_cost": "23.43",
        "data_read_per_join": "198K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (98320,98321,98482,98572,98573,98574,98575,98576,98577,98578,98579,98580,98581,98582,98583,98584,98585,98586,98690,98693,98694,98758,99561,100374,100375,100376,100377,100378,100379,100380,100381,100382,100383,100598,100601,101635,101636,101639,101640,101641,101642,101643,101644,101645,101646,101647,101648,101649,101650,101651,101652,101653)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}