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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329183e1f9510d35d860808f1e3351ad4812771acf5a816da6ec9e2f808be3b4' 
  AND token = 'sS0Ji1k9/qebTiE7hdcJNfjrzJt5U/JLgkJ25Xk+K7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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