SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0ca9ddd2b702aa5e1f7c3d8563c39cb5bd54fd3e8259f745aa78a8ca1d9e45' 
  AND token = '4z4PbqYu3CzaQjM+YrBpijo0gv0jRLJ4+pHJ30HijZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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