Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908a532a307a2c9b494a490db2b45ec959400dbc893e2e2e3aa9c7012d4edf9c' 
  AND token = 'FT5di23Ew7VB/73/ZPPqQ5PXo2mXJnl3eWP9P+Kn0WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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