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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133dee7187fb24d5fa16f71ca557e69a18d60d48c1a5b9b276b6b565889e407a' 
  AND token = 'CVHyZZBSsAiXnQcIE9h+XITp9FdmOLc85X7PZp/S7S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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