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 (
    1653, 1652, 1726, 1725, 1724, 1558, 1559, 
    1560, 1600, 1564, 1563, 1641, 2903, 
    1596, 1562, 2907, 2908, 2910, 2077, 
    1526, 1587, 1684, 1561, 2870, 1687, 
    2758, 1599, 2984, 2985, 2992, 2993, 
    1607, 1609, 1595, 8553, 8558, 8557, 
    8560
  )

Query time 0.00197

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "39.91"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "pfv",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 38,
          "rows_produced_per_join": 38,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`pfv`.`variant_id` in (1653,1652,1726,1725,1724,1558,1559,1560,1600,1564,1563,1641,2903,1596,1562,2907,2908,2910,2077,1526,1587,1684,1561,2870,1687,2758,1599,2984,2985,2992,2993,1607,1609,1595,8553,8558,8557,8560))",
          "cost_info": {
            "read_cost": "22.81",
            "eval_cost": "3.80",
            "prefix_cost": "26.61",
            "data_read_per_join": "43K"
          },
          "used_columns": [
            "variant_id",
            "position"
          ]
        }
      },
      {
        "table": {
          "table_name": "pfvd",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id",
            "lang_code"
          ],
          "key_length": "9",
          "ref": [
            "softwarepirmam_hewadelivard_cscart_4.pfv.variant_id",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 38,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "9.50",
            "eval_cost": "3.80",
            "prefix_cost": "39.91",
            "data_read_per_join": "114K"
          },
          "used_columns": [
            "variant_id",
            "variant",
            "lang_code"
          ]
        }
      }
    ]
  }
}