Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b69567e33a31aa7602f2ffcb6ed0a1b0004a968ad94b6b40cb205a3c8594b2f' 
  AND token = 'vAzBQ0bEVJ7kXbQxwSTP/R8o9DT/W1nrWeWwcRdt8uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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