Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c419b2b62ba204445a3a272615605216d346fd9444fbe5a6f674b3abcc91106e' 
  AND token = '4cOEPL1TO84OnjyHiOewwy6ziQ0yeotRaN8CCCwWuJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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