Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb6a1fc2c3e30957e08aa59dd53278aa8d07f634d4a49d212ecb4febf97c0c3' 
  AND token = '7/Qfrind32F4fIA1yNvf1GJ8IfqeUBR7tmmA4Wia2pw=' 
  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"
    }
  }
}