Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78e190c9b29a167db5223188acf9d08d0ff5b8f9d97b93b07b214c9870cad03' 
  AND token = 'g5Rx52K8AhtlWXT5E+ljquD7qX8Vz/RxyEn/gfHrx2c=' 
  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"
    }
  }
}