Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada8478e782ce2a4a1160df3ad86862ebb4aaeeebbb4d51ba562479791518183' 
  AND token = '8YH9EwrCLkKBAeCm+9py5QuJqCpT2kKWUyYURN2LRwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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