SELECT 
  a.option_id, 
  a.product_id 
FROM 
  cscart_product_options AS a 
WHERE 
  a.product_id IN (1515) 
  AND a.status = 'A'

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "a",
      "access_type": "ref",
      "possible_keys": ["c_status"],
      "key": "c_status",
      "key_length": "6",
      "used_key_parts": ["product_id", "status"],
      "ref": ["const", "const"],
      "rows": 1,
      "filtered": 100,
      "index_condition": "a.`status` = 'A'"
    }
  }
}