Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e567fe6d1d6439d959ccbb2412e68f39b02c1cee2ba9a407070b5e3d3e18c18' 
  AND token = 'GpNMcEQe9QMb4iGaBx5i8flT/1Q5AdsatNWzoLlxZYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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