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SELECT 
  b.variant_name, 
  a.* 
FROM 
  cscart_product_option_variants AS a 
  LEFT JOIN cscart_product_option_variants_descriptions AS b ON b.variant_id = a.variant_id 
  AND b.lang_code = 'en' 
WHERE 
  1 
  AND a.option_id IN (29, 34, 30, 31, 28) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.050190226,
    "nested_loop": [
      {
        "read_sorted_file": {
          "filesort": {
            "sort_key": "a.position, a.variant_id",
            "table": {
              "table_name": "a",
              "access_type": "range",
              "possible_keys": ["status", "option_id", "option_id_2"],
              "key": "option_id",
              "key_length": "6",
              "used_key_parts": ["option_id", "status"],
              "loops": 1,
              "rows": 15,
              "cost": 0.02310312,
              "filtered": 100,
              "index_condition": "a.option_id in (29,34,30,31,28) and a.`status` = 'A'"
            }
          }
        }
      },
      {
        "table": {
          "table_name": "b",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["variant_id", "lang_code"],
          "ref": ["u428615623_ecartifygonje.a.variant_id", "const"],
          "loops": 15,
          "rows": 1,
          "cost": 0.0175126,
          "filtered": 100,
          "attached_condition": "trigcond(b.lang_code = 'en')"
        }
      }
    ]
  }
}

Result

variant_name	variant_id	option_id	position	modifier	modifier_type	weight_modifier_type	point_modifier_type	status
1L	133	28	10	0.000	A	A	A	A
1L	136	29	10	0.000	A	A	A	A
1L	139	30	10	0.000	A	A	A	A
1L	142	31	10	0.000	A	A	A	A
No Chilli	152	34	10	0.000	A	A	A	A
5L	135	28	20	120.000	A	A	A	A
3L	137	29	20	70.000	A	A	A	A
3L	140	30	20	55.000	A	A	A	A
3L	143	31	20	50.000	A	A	A	A
Mild	153	34	20	0.000	A	A	A	A
3L	134	28	30	60.000	A	A	A	A
5L	138	29	30	140.000	A	A	A	A
5L	141	30	30	110.000	A	A	A	A
5L	144	31	30	100.000	A	A	A	A
Spicy	154	34	30	0.000	A	A	A	A