SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb27f879a86417d48e651240a634394750f8d5f618d836537518a531ab3d1ee2' 
  AND token = 'pVHbIqmAz2vLKpJdv+qvEGrAY03fJjo9fddu8cNmpJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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