Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b894cb53139ed03b0f945db8d37898f9681d3e2baee890bc1a9c1400f199d82b' 
  AND token = 'o5s4FZ5u7ZmTGSvSkdeN/zfRMwke0pfbasmm0fR/Rtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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