Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8cf46e5db859821d2222faa8b408c693edbb5e0e7882639d88357582e9f7b4' 
  AND token = '1cBdHXWuLyQRGFCcNdmwYQg3gKfOb/IW+8ede2bSFVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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