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, 1553, 1563, 1562, 1555, 1554, 
    1564, 1552, 1560, 1561, 1559, 1659, 
    1558, 1556, 1557, 1660, 1614, 1633, 
    1687, 1637, 1636, 1635, 1634, 1613, 
    1726, 1725, 1724, 1526, 1773, 1775, 
    1776, 1774, 1684, 1912, 1607, 1913, 
    2907, 2908, 2910, 2870, 1596, 1600, 
    2758, 2992, 2993, 2985, 2315, 1599, 
    4733, 1610, 4734, 4735, 4765, 4766, 
    4767, 4839, 5064, 5063, 1595, 3809, 
    7191, 1681, 2077, 6250, 1754, 7521, 
    7064, 1784, 7534, 7535, 1606, 2243, 
    2443, 1565
  )

Query time 0.00157

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "78.76"
    },
    "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": 75,
          "rows_produced_per_join": 75,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`pfv`.`variant_id` in (1653,1652,1553,1563,1562,1555,1554,1564,1552,1560,1561,1559,1659,1558,1556,1557,1660,1614,1633,1687,1637,1636,1635,1634,1613,1726,1725,1724,1526,1773,1775,1776,1774,1684,1912,1607,1913,2907,2908,2910,2870,1596,1600,2758,2992,2993,2985,2315,1599,4733,1610,4734,4735,4765,4766,4767,4839,5064,5063,1595,3809,7191,1681,2077,6250,1754,7521,7064,1784,7534,7535,1606,2243,2443,1565))",
          "cost_info": {
            "read_cost": "45.01",
            "eval_cost": "7.50",
            "prefix_cost": "52.51",
            "data_read_per_join": "85K"
          },
          "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": 75,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "18.75",
            "eval_cost": "7.50",
            "prefix_cost": "78.76",
            "data_read_per_join": "226K"
          },
          "used_columns": [
            "variant_id",
            "variant",
            "lang_code"
          ]
        }
      }
    ]
  }
}