Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d33e2da022bcb3a06e7c6e9ab28be81197adee07cef165ab69df9d2781b7e92' 
  AND token = 'a+6p13yhVysOyjScpP10c2UFZH6805+5FbOJFS+Dlm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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