Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6f5e4dcc73a6a39b2347a7da639df25fd79002f0810e80e92605c8323e3581' 
  AND token = 'qd6vZolDbCW7QZRYhM0NoVVAYNlN50Q/xjLjQSRjp8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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