SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b11f74a1cfebb671d28ed26df5819b6f85af6ba0351acfdec4c5513d03cb4db' 
  AND token = 'Gds14g+impPzLZqJdJHdBxhHm0Z8LipCUxjj7eYbKNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}