SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0c4807887935ce2e222575cffb2df27b3941375b2ea2bdad17b2a5268f0209' 
  AND token = 'kIf4D2zwwhZqJE/n+B4KqALVMsgscqLhf8EvzrpFwYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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