Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b53580d6f771e524825d23da2a85c462b68be9f42e51246c6ee7f2a93f3d67' 
  AND token = '2bWlaufAVgCeZHUtFpRcQQ+fz1P+PMMPACwEKDsOk4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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