Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6ec92c3be3291e0266d8d6331745d14bb77798095ce233218447922121faf3' 
  AND token = '5+vcm2N8TdE5C2Zw83CSIR+sN4G6Di8FWYRFKPnshzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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