SELECT 
  * 
FROM 
  cscart_product_feature_variants 
WHERE 
  variant_id IN (
    1, 1313, 1298, 289, 1299, 125, 126, 281, 
    504, 508, 258, 1329, 453, 494, 236, 462, 
    424, 239, 1297, 290, 250, 251, 302, 383, 
    122, 240, 121, 127, 149, 120, 123, 152, 
    270, 234, 146, 50, 57, 58, 147, 9, 15, 
    18, 11, 6, 8, 30, 25, 26, 1453, 426, 267, 
    507, 287, 1303, 294, 262, 162, 263, 421, 
    110, 264, 265, 422, 1305, 282, 111, 260, 
    1300, 54, 304, 303, 237
  )

Query time 0.00076

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "50.41"
    },
    "table": {
      "table_name": "cscart_product_feature_variants",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "variant_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 72,
      "rows_produced_per_join": 72,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_product_feature_variants`.`variant_id` in (1,1313,1298,289,1299,125,126,281,504,508,258,1329,453,494,236,462,424,239,1297,290,250,251,302,383,122,240,121,127,149,120,123,152,270,234,146,50,57,58,147,9,15,18,11,6,8,30,25,26,1453,426,267,507,287,1303,294,262,162,263,421,110,264,265,422,1305,282,111,260,1300,54,304,303,237))",
      "cost_info": {
        "read_cost": "43.21",
        "eval_cost": "7.20",
        "prefix_cost": "50.41",
        "data_read_per_join": "111K"
      },
      "used_columns": [
        "variant_id",
        "feature_id",
        "url",
        "color",
        "position",
        "abt__ut2_color_style",
        "abt__ut2_multicolor"
      ]
    }
  }
}