SELECT 
  * 
FROM 
  cscart_product_feature_variants 
WHERE 
  variant_id IN (
    1661, 597, 1, 441, 1634, 429, 433, 513, 
    1805, 1667, 1662, 1633, 1619, 460, 447, 
    122, 121, 440, 127, 439, 1349, 362, 438, 
    149, 246, 120, 1668, 1804, 430, 448, 
    1620, 442, 1663, 1623, 1635, 1630, 1664, 
    146, 431, 446, 59, 147, 98, 280, 1637, 
    1627, 1629, 170, 1628, 165
  )

Query time 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "35.01"
    },
    "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": 50,
      "rows_produced_per_join": 50,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_product_feature_variants`.`variant_id` in (1661,597,1,441,1634,429,433,513,1805,1667,1662,1633,1619,460,447,122,121,440,127,439,1349,362,438,149,246,120,1668,1804,430,448,1620,442,1663,1623,1635,1630,1664,146,431,446,59,147,98,280,1637,1627,1629,170,1628,165))",
      "cost_info": {
        "read_cost": "30.01",
        "eval_cost": "5.00",
        "prefix_cost": "35.01",
        "data_read_per_join": "77K"
      },
      "used_columns": [
        "variant_id",
        "feature_id",
        "url",
        "color",
        "position",
        "abt__ut2_color_style",
        "abt__ut2_multicolor"
      ]
    }
  }
}