Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085ed777befc6964335c9f7b4ab9d68a79a880cf30979b9edc3c088e565f3fab' 
  AND token = '59VrbjToavK6uxSJ9dhz+dgyTp0M3bQ1os2IpzNpafk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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