Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90134945b32a4926da5e141b9c933f51b79e4967f7c6954aae28d47794a7568b' 
  AND token = 'JUcXwVtCOBYHiZTfjIp+elZt9cEm+ydtn4z4jXTeYSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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