SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06928928d09863b5f2ccd3bdbe6d7a6c1697764bc65f628879d26d89380e1775' 
  AND token = 'vg+8/qXvFLYc9rpoHtwpjYv+JBEYOj4Qg0liuwBrcGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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