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 = 'en' 
WHERE 
  cscart_product_feature_variants.variant_id IN (
    9, 12, 5678, 5774, 5775, 5782, 5785, 5786, 
    5787, 5788, 5789, 5919, 6795, 8072, 
    8122, 8149, 8150, 8151, 8152, 8153, 
    8154, 8155, 8156, 8157, 8158, 8159, 
    8160, 8161, 8162, 8163, 15605, 15606, 
    15607, 15608, 15609, 15610, 15734, 
    15735, 15736, 15737, 15738, 15739, 
    15740, 15741, 15742, 15743, 15744, 
    19388, 19389, 19390, 19391, 19393
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.01218

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": 52,
          "filtered": 100,
          "index_condition": "cscart_product_feature_variants.variant_id in (9,12,5678,5774,5775,5782,5785,5786,5787,5788,5789,5919,6795,8072,8122,8149,8150,8151,8152,8153,8154,8155,8156,8157,8158,8159,8160,8161,8162,8163,15605,15606,15607,15608,15609,15610,15734,15735,15736,15737,15738,15739,15740,15741,15742,15743,15744,19388,19389,19390,19391,19393)"
        },
        "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": [
            "devmotorsbay.cscart_product_feature_variants.variant_id",
            "const"
          ],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_product_feature_variant_descriptions.lang_code = 'en')"
        }
      }
    }
  }
}