Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f84606a06a9756f3fcdbf5d8dfe5391ae5503f377e3a3c60e7baecc14f4378' 
  AND token = 'ioAcEmhImoIA8NCXo+vDkH6ufH+/w0lxilSSyWm8/Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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