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 (
    1600, 9507, 1596, 9505, 9529, 1783, 9528, 
    9359, 9517, 9506, 9045, 1674, 9590, 
    9323, 9524, 9692, 9772, 9523, 6360, 
    9522, 9778, 3037, 9588, 9802, 9627, 
    9321, 1682, 10057, 10058
  )

Query time 0.00097

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 (1600,9507,1596,9505,9529,1783,9528,9359,9517,9506,9045,1674,9590,9323,9524,9692,9772,9523,6360,9522,9778,3037,9588,9802,9627,9321,1682,10057,10058))",
          "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"
          ]
        }
      }
    ]
  }
}