Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9be960b672f5be506eb4ce0b9eb920a9b8897be3c4ab047c26bfb60aed9293' 
  AND token = 'zvJrCXZPKQilJ3UeFoKetT+c9qlBQFJHcNqYZISdxes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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