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, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    1306, 1307, 1310, 1308, 1309, 1311, 1314, 
    1313, 1318, 1319, 1315, 1316, 1317, 
    56, 1299, 1298, 1297, 1260, 1296, 1295, 
    990, 1294, 1293, 1129, 1278, 1269, 1261, 
    1292, 1291, 1290, 1289, 1288, 1287, 
    1286, 1285, 1284, 1283, 1282, 1275, 
    1281, 1280, 1279, 1274, 1145, 1134, 
    1273, 1272, 93
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00147

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 48,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (1306,1307,1310,1308,1309,1311,1314,1313,1318,1319,1315,1316,1317,56,1299,1298,1297,1260,1296,1295,990,1294,1293,1129,1278,1269,1261,1292,1291,1290,1289,1288,1287,1286,1285,1284,1283,1282,1275,1281,1280,1279,1274,1145,1134,1273,1272,93) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
56
93
990
1129
1134
1145
1260
1261
1269
1272
1273
1274
1275
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1306
1307
1308
1309
1310
1311
1313
1314
1315
1316
1317
1318
1319