SELECT 
  * 
FROM 
  jmj_product_feature_variants 
WHERE 
  variant_id IN (
    3246, 3247, 2103, 2112, 2120, 2126, 2140, 
    2164, 2190, 2194, 2224, 2229, 766
  )

Query time 0.01369

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "31.21"
    },
    "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": 13,
      "rows_produced_per_join": 13,
      "filtered": "100.00",
      "index_condition": "(`jmj_test`.`jmj_product_feature_variants`.`variant_id` in (3246,3247,2103,2112,2120,2126,2140,2164,2190,2194,2224,2229,766))",
      "cost_info": {
        "read_cost": "28.61",
        "eval_cost": "2.60",
        "prefix_cost": "31.21",
        "data_read_per_join": "20K"
      },
      "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
2112 280 #191970 52 default
2120 280 #6495ed 84 default
2126 280 #b0c4de 105 default
2140 280 #5f9ea0 145 default
2164 280 #f5fffa 242 default
2190 280 #8b4513 339 default
2194 280 #ffa07a 367 default
2224 280 #800080 502 default
2229 280 #dda0dd 526 default
3246 31 #ffffff 130 default
3247 31 #ffffff 131 default