Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27349833ea900f247a3e07283b561c12ea12eff0e9ce0a4db47622dd2e9d6fc' 
  AND token = 'xsmikpWTLrzjEkWkzg1rHDkBazyQdURv+NC1r8DYf1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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