SELECT 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variants.color, 
  cscart_product_feature_variant_descriptions.variant 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variants.variant_id = cscart_product_feature_variant_descriptions.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'ru' 
WHERE 
  cscart_product_feature_variants.variant_id IN (
    523, 50, 58, 376, 1763, 120, 122, 438, 
    440, 146, 147, 280, 1767, 1769, 59, 1773, 
    439, 1798, 127, 149, 1753, 154, 1778, 
    165, 1783, 1751, 182, 1756, 1757, 1758, 
    1761, 1790
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00096

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "33.61"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_product_feature_variants",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 32,
            "rows_produced_per_join": 32,
            "filtered": "100.00",
            "index_condition": "(`test_uchur_k`.`cscart_product_feature_variants`.`variant_id` in (523,50,58,376,1763,120,122,438,440,146,147,280,1767,1769,59,1773,439,1798,127,149,1753,154,1778,165,1783,1751,182,1756,1757,1758,1761,1790))",
            "cost_info": {
              "read_cost": "19.21",
              "eval_cost": "3.20",
              "prefix_cost": "22.41",
              "data_read_per_join": "49K"
            },
            "used_columns": [
              "variant_id",
              "color",
              "position"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_feature_variant_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "test_uchur_k.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 32,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "8.00",
              "eval_cost": "3.20",
              "prefix_cost": "33.61",
              "data_read_per_join": "99K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}