SELECT 
  pfvd.*, 
  pfv.* 
FROM 
  cscart_product_feature_variants pfv 
  LEFT JOIN cscart_product_feature_variant_descriptions pfvd ON pfvd.variant_id = pfv.variant_id 
  AND pfvd.lang_code = 'en' 
WHERE 
  pfv.variant_id IN (1945, 1945)

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.06"
    },
    "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": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`pfv`.`variant_id` in (1945,1945))",
          "cost_info": {
            "read_cost": "0.61",
            "eval_cost": "0.10",
            "prefix_cost": "0.71",
            "data_read_per_join": "1K"
          },
          "used_columns": [
            "variant_id",
            "feature_id",
            "url",
            "color",
            "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": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "1.06",
            "data_read_per_join": "3K"
          },
          "used_columns": [
            "variant_id",
            "variant",
            "description",
            "page_title",
            "meta_keywords",
            "meta_description",
            "lang_code"
          ]
        }
      }
    ]
  }
}