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 (
    5916, 1280, 1241, 1281, 1282, 1283, 1198, 
    5899, 1201, 1219, 1257, 1313, 5908, 
    5902, 1314, 1199, 1200, 5905, 5904, 
    1425, 5914, 5912, 5907, 1449, 5906, 
    5898, 5910, 5915, 5913, 5903, 5909, 
    5901, 1203, 1230, 1255, 1254, 5900, 
    1269, 1204, 5942, 5940
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "cscart_product_feature_variants.position, cscart_product_feature_variant_descriptions.variant",
      "temporary_table": {
        "table": {
          "table_name": "cscart_product_feature_variants",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["variant_id"],
          "rows": 41,
          "filtered": 100,
          "index_condition": "cscart_product_feature_variants.variant_id in (5916,1280,1241,1281,1282,1283,1198,5899,1201,1219,1257,1313,5908,5902,1314,1199,1200,5905,5904,1425,5914,5912,5907,1449,5906,5898,5910,5915,5913,5903,5909,5901,1203,1230,1255,1254,5900,1269,1204,5942,5940)"
        },
        "table": {
          "table_name": "cscart_product_feature_variant_descriptions",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["variant_id", "lang_code"],
          "ref": [
            "noframes_angrybeaver.cscart_product_feature_variants.variant_id",
            "const"
          ],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_product_feature_variant_descriptions.lang_code = 'ru')"
        }
      }
    }
  }
}