Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec773a9e9541b88e6598b3caa773c7c4616f50ecd357dc2e6123a816d23af9b' 
  AND token = '7C4M5y/TC+cnqzB7TnX8xl9LmaF82PggiGcBmZ8Wm+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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