Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3f10ae5585d2bd7dbb90745212159ef5827e21f101a54e2a202414a48a0cd8' 
  AND token = 'QDXrEcHhJnfO4OfWPY+9jdydQIEmrc38VtUiVLj/Fbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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