Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7d3ad011c633f381e4d2ad31b84dc1e818799a9dae01d3fc1db8b7bb8336f8' 
  AND token = '0Ez8yLvp7asMXtPk3vsDcBFUDwKsI+xkq8gx3aXdXgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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