Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3d66555acaa2a96c7d5b757ba678011ca70bb5389818966959f6cb7cf7c461' 
  AND token = '9uvQarh9hqNcp8hPVuR64i6Q2PRazNPk0ruYIzQrRew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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