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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c4fc05cd305b5ae014ef6aea6e00a57026e1f0fd2a228c65a04e16947dab4e' 
  AND token = 'alHHe/nY480sEBgdrviuhhK5sBK4v9X8yUGgH2I9OdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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