Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd422c7935f3a168a5f8b1564c6f7bd5d802a0c15842b79e7b7972c5d31aceb84' 
  AND token = 'fwXDqrm3ouyEucN99Z4frHnl+fub+BKN1DU0DwXIyBM=' 
  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"
    }
  }
}