SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d6594d67963f1c668d3c3ba134c28209e95ae133570e5cf356bd306f136341' 
  AND token = 'AuVJ0PPPMoJndbkOluQhJKG7WHAwxLBvCLwpWuiUlnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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