Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db886800b407fd2979971c22d100742c01e8486bd20605c55e8e0481e034ab67' 
  AND token = 'C29y+qffR1AnHVUv3gsFnJ0vvUyyWUXHF5ARcwB+L88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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