Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81ec6a9bca078d62f279b553153124039cdfd11eeda1dc08e9b9094ba4e5a24' 
  AND token = 'hPs7XkNEQO1nxkxVIdOnXi8EHknNPMYqdp1T00DAW4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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