Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b846427a5c02fa6dbde9a996a20f0a179f7dac5d8e9e4d2becf11d7dfce9238' 
  AND token = 'uDvQ1e2nr6RKbOEpaQAbBX5GO9qFl0GuiPpLdYw6DAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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