SELECT 
  pfv.variant_id, 
  pfv.position, 
  pfvd.variant 
FROM 
  cscart_product_feature_variants AS pfv 
  INNER JOIN cscart_product_feature_variant_descriptions AS pfvd ON pfv.variant_id = pfvd.variant_id 
  AND pfvd.lang_code = 'en' 
WHERE 
  pfv.variant_id IN (
    62213, 62212, 62214, 62215, 62216, 62217, 
    62218, 63591, 63592, 62221, 63598, 
    62228, 63599, 1196, 67013, 1193, 67011, 
    1195, 1194, 1197, 1364, 67291
  )

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "57.23"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "pfvd",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id",
            "lang_code"
          ],
          "key_length": "9",
          "rows_examined_per_scan": 22,
          "rows_produced_per_join": 22,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "26.43",
            "eval_cost": "4.40",
            "prefix_cost": "30.83",
            "data_read_per_join": "99K"
          },
          "used_columns": [
            "variant_id",
            "variant",
            "lang_code"
          ],
          "attached_condition": "((`webmarco`.`pfvd`.`variant_id` in (62213,62212,62214,62215,62216,62217,62218,63591,63592,62221,63598,62228,63599,1196,67013,1193,67011,1195,1194,1197,1364,67291)) and (`webmarco`.`pfvd`.`lang_code` = 'en'))"
        }
      },
      {
        "table": {
          "table_name": "pfv",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id"
          ],
          "key_length": "3",
          "ref": [
            "webmarco.pfvd.variant_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 22,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "22.00",
            "eval_cost": "4.40",
            "prefix_cost": "57.23",
            "data_read_per_join": "25K"
          },
          "used_columns": [
            "variant_id",
            "position"
          ]
        }
      }
    ]
  }
}