SELECT 
  product_descriptions.product_id, 
  product_descriptions.short_description, 
  IF(
    product_descriptions.short_description = '' 
    OR product_descriptions.short_description IS NULL, 
    product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  product_descriptions 
WHERE 
  product_descriptions.product_id IN (
    304913, 301216, 303191, 300978, 304911, 
    304879, 304816, 303211, 301002, 300966, 
    304912, 304915, 304914, 303127, 301120, 
    303190, 301000, 301217
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00659

JSON explain

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      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
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        "lang_code"
      ],
      "key_length": "11",
      "rows_examined_per_scan": 18,
      "rows_produced_per_join": 18,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "13.32",
        "eval_cost": "1.80",
        "prefix_cost": "15.12",
        "data_read_per_join": "91K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (304913,301216,303191,300978,304911,304879,304816,303211,301002,300966,304912,304915,304914,303127,301120,303190,301000,301217)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
300966 <p>Laser engraved bamboo cutting board with kitchen conversions.&nbsp;<br></p> <p>Please select design in Personalize&nbsp;</p> <p>All boards are sprayed with Polycrylic polyurethane spray to help protect the bamboo.&nbsp;</p> <p>All cutting boards are engraved to order. Please allow 5-7 days for processing.&nbsp;<br></p>
300978 <p>These personalized trays are custom made to order and prices are customized to the order.&nbsp;</p> <p>We do have multiple designs to choose from and we look forward to designing a tray to match your tastes.&nbsp;</p> <p>All trays are custom engraved to order.&nbsp;Please allow 5-7 days for processing after design has been approved.<br></p>
301000 <p>20 oz. Sublimated Straight Skinny Tumbler</p> <p>Comes with straw.</p> <p>All tumblers are made to order. Please allow 5-7 days for processing.</p>
301002 <p>16 oz. Beer Can Glass with Bamboo Lid and Straw<br></p> <p>All tumblers are made to order. Please allow 5-7 days for processing.<br></p>
301120 <p>Sublimated Coffee Mug with design on both sides</p> <p>Aprox. 12 oz. </p> <p>All cups are made to order. Please allow 5-7 days for processing.<br></p>
301216 <p>Sublimated Neoprene Car Coasters</p> <p>All car coasters are made to order. Please allow 5-7 days for processing.<br></p>
301217 <p>Laser marked 6 oz. Stainless Steel Flask</p> <p>Includes funnel</p> <p>All flasks are "engraved" to order. Please allow 5-7 days for processing.<br></p>
303127 <p>Laser Engraved Bamboo Cutting Board</p> <p>All boards are sprayed with Polycrylic polyurethane spray to help protect the bamboo.&nbsp;</p> <p>All cutting boards are engraved to order. Please allow 5-7 days for processing.&nbsp;</p> <p><br></p>
303190 <p>20 oz. Sublimated Straight Skinny Tumbler</p> <p>Comes with straw.</p> <p>All tumblers are made to order. Please allow 5-7 days for processing.</p>
303191 <p>Sublimated Neoprene Car Coasters</p> <p>All car coasters are made to order. Please allow 5-7 days for processing.</p>
303211 <p>20 oz. Sublimated Straight Skinny Tumbler</p> <p>Comes with straw.</p> <p>All tumblers are made to order. Please allow 5-7 days for processing.</p> <p></p>
304816 <p>Glass Cutting Board with Kitchen Conversions and Sunflowers</p> <p>All glass cutting boards are sublimated to order. Please allow 5-7 days for processing.&nbsp;<br></p>
304879 <p>Laser engraved glass cutting board with kitchen conversions.&nbsp;</p> <p>All cutting boards are engraved to order. Please allow 5-7 days for processing.&nbsp;<br></p>
304911 <p>Laser engraved glass cutting board.&nbsp;</p> <p>All cutting boards are engraved to order. Please allow 5-7 days for processing.&nbsp;</p>
304912 <p>Sublimated Neoprene Car Coasters</p> <p>All car coasters are made to order. Please allow 5-7 days for processing.</p> <p></p>
304913 <p>Sublimated Neoprene Car Coasters</p> <p>All car coasters are made to order. Please allow 5-7 days for processing.</p> <p></p>
304914 <p>Sublimated Neoprene Car Coasters</p> <p>All car coasters are made to order. Please allow 5-7 days for processing.</p> <p></p>
304915 <p>Laser engraved bamboo cutting board.&nbsp;</p> <p>Please select design in Personalize&nbsp;</p> <p>All boards are sprayed with Polycrylic polyurethane spray to help protect the bamboo.&nbsp;</p> <p>All cutting boards are engraved to order. Please allow 5-7 days for processing.&nbsp;</p>