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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb35b9afe09f664337568d38fcb19b6c2b172bcc6a37100f8456e0d2534b6776' 
  AND token = '4O1UdP89Q58CI/Z7bYyLPQpTceT+tl6lV9d9j2XnFVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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