SELECT 
  * 
FROM 
  jmj_product_feature_variants 
WHERE 
  variant_id IN (
    3246, 3247, 2103, 2144, 2145, 2147, 2152, 
    2178, 2180, 2181, 2192, 2201, 2202, 
    2224, 2228, 2236, 766
  )

Query time 0.02760

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "40.81"
    },
    "table": {
      "table_name": "jmj_product_feature_variants",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "variant_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 17,
      "rows_produced_per_join": 17,
      "filtered": "100.00",
      "index_condition": "(`jmj_test`.`jmj_product_feature_variants`.`variant_id` in (3246,3247,2103,2144,2145,2147,2152,2178,2180,2181,2192,2201,2202,2224,2228,2236,766))",
      "cost_info": {
        "read_cost": "37.41",
        "eval_cost": "3.40",
        "prefix_cost": "40.81",
        "data_read_per_join": "26K"
      },
      "used_columns": [
        "variant_id",
        "feature_id",
        "url",
        "color",
        "position",
        "abt__ut2_color_style",
        "abt__ut2_multicolor"
      ]
    }
  }
}

Result

variant_id feature_id url color position abt__ut2_color_style abt__ut2_multicolor
766 132 #ffffff 1 default
2103 280 #000000 0 default
2144 280 #2e8b57 161 default
2145 280 #3cb371 166 default
2147 280 #808000 172 default
2152 280 #32cd32 196 default
2178 280 #eee8aa 265 default
2180 280 #ffff00 272 default
2181 280 #ffd700 279 default
2192 280 #ff8c00 360 default
2201 280 #ff0000 381 default
2202 280 #b22222 391 default
2224 280 #800080 502 default
2228 280 #9370db 516 default
2236 280 #fffff0 548 default
3246 31 #ffffff 130 default
3247 31 #ffffff 131 default