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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac81bfe54fc5e6941d6eadb2ef95b45c00116f1a92c4f7eff1b66eb39622e3e6' 
  AND token = 'FsiWe3xMtebfdHmT063iIULuUsO2wcfk+hS41GLjUDo=' 
  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"
    }
  }
}