Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae18a3d654cf0264f2f0ed63b4cfcf488b7f1237837a93163784bbef92179e3' 
  AND token = 'A794B/kakqiBUoAWDULIMioSlj0DQL2RteSH6fseVtg=' 
  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"
    }
  }
}