Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6385e2c8eeae88c18ef9b2553732df3eee68a97799b4bfea54285d1c0d4d0050' 
  AND token = 'iFMKyzCYkQkkHd9392/5ruPPMsjZKPxfcved09L0L4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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