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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8caf8333e5a481c0f543de2f6448315d89ae8b8967d4b397410514405c50ed' 
  AND token = 'I5K8Z/B/UaaJctx7KVIWuVCddf+D4UxmCNVtzhJFJVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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