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 (
    12, 8155, 8161, 8149, 8150, 15735, 15736, 
    15737, 15738, 8151, 8152, 15734, 8156, 
    8157, 15742, 15743, 6795, 19393, 8153, 
    8154, 8158, 8159, 8160, 8162, 15739, 
    15740, 15741, 8163, 15744, 9, 5678, 
    5774, 5775
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.01004

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": 33,
          "filtered": 100,
          "index_condition": "cscart_product_feature_variants.variant_id in (12,8155,8161,8149,8150,15735,15736,15737,15738,8151,8152,15734,8156,8157,15742,15743,6795,19393,8153,8154,8158,8159,8160,8162,15739,15740,15741,8163,15744,9,5678,5774,5775)"
        },
        "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')"
        }
      }
    }
  }
}