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 = 'ar' 
WHERE 
  pfv.variant_id IN (
    1553, 1563, 1562, 1555, 1554, 1564, 1552, 
    1560, 1561, 1559, 1659, 1558, 1556, 
    1557, 1660, 7521, 1607, 7064, 1784, 
    7534, 7535, 1776, 1606, 2243, 2443, 
    1565, 1595, 1596, 1600
  )

Query time 0.00126

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "30.46"
    },
    "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": 29,
          "rows_produced_per_join": 29,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`pfv`.`variant_id` in (1553,1563,1562,1555,1554,1564,1552,1560,1561,1559,1659,1558,1556,1557,1660,7521,1607,7064,1784,7534,7535,1776,1606,2243,2443,1565,1595,1596,1600))",
          "cost_info": {
            "read_cost": "17.41",
            "eval_cost": "2.90",
            "prefix_cost": "20.31",
            "data_read_per_join": "33K"
          },
          "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": 29,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "7.25",
            "eval_cost": "2.90",
            "prefix_cost": "30.46",
            "data_read_per_join": "87K"
          },
          "used_columns": [
            "variant_id",
            "variant",
            "lang_code"
          ]
        }
      }
    ]
  }
}