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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072c340d435e14a00ad9d2edf16ece48f76be6962812423ccb65483d2dc8db36' 
  AND token = 'sGy5fMkT/ECXFYD/cCAbyFsblRT5TOHd/cJ6WsGI9uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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