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 (264369, 264384, 264381, 264368) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00143

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "3.33"
    },
    "table": {
      "table_name": "product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "11",
      "rows_examined_per_scan": 4,
      "rows_produced_per_join": 4,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "2.93",
        "eval_cost": "0.40",
        "prefix_cost": "3.33",
        "data_read_per_join": "20K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (264369,264384,264381,264368)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}

Result

product_id short_description full_description
264368 <p>Fabulous fluorite pendant necklace is great for all occasions.&nbsp; Fluorite has natural purple, green, and gray inclusions, making every pendant unique.&nbsp; The pendant is approximately 1.5 inches long in the shape of a hexagon.&nbsp; <br></p> <p>The shiny gold plated chain comes in two lengths: 17 and 18 inch necklaces.<br></p> <p>The silver plated chain comes in 18 inch necklaces.</p> <p>Glue is more visible on some pendants.<br></p>
264369 <p>This pair of emerald green and silver plated hoop earrings are stylish.&nbsp; Each earring is handmade with tiny emerald green and clear seed beads intricately wire-wrapping around the hoop's circumference.&nbsp; There are also three emerald green glass beads hanging on each earring's center base.&nbsp; This pair of earrings is lightweight and swings.&nbsp; These are medium-sized earrings, with the diameter measuring approximately 2.5 inches in length and 1.25 inches in diameter.<br></p>
264381 <p>This pair of bright pink and silver plated hoop earrings are stylish.&nbsp; Each earring is handmade with tiny light pink and clear seed beads intricately wire-wrapped around the hoop's circumference.&nbsp; There are also three bright pink resin beads hanging on each earring's center base.&nbsp; This pair of earrings is lightweight and swings.&nbsp; These are medium-sized earrings, with the diameter measuring approximately 2.5 inches in length and 1.25 inches in diameter.&nbsp; <br></p> <p>These earrings also come in green! Tiny emerald green and clear seed beads are wire-wrapped around the hoop's circumference with three lime green resin beads hanging from the center base.<br></p>
264384 <p>Intricately handmade wire-wrapped dangle hoop earrings are great for many occasions.&nbsp; Tiny emerald green seed beads are wire-wrapped along the hoop's silver plated circumference.&nbsp; There is translucent light green teardrop dangling from the top center of the hoop and small round cream glass beads swinging from the hoop's center base.&nbsp; This pair of earrings are lightweight and measure approximately 2 and 1/4 inches in length and 1 and 1/8 inches in diameter.&nbsp; These earrings are small to medium-size.<br></p> <p>Comes in hot pink magenta, too! Tiny hot pink seed beads wire-wrapped around the circumference of the hoop.&nbsp; A hot pink magenta teardrop bead hangs from the hoop's top center.&nbsp; Three larger seed beads swing from each earring's center base.&nbsp; These are also handmade, so they have similar dimensions dimensions.<br></p>