SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1c20282259229998ae8afa119a1c3710a8d17d49d2dffb8ec90fdb5a2879c3' 
  AND token = 'g30CJKCFTcvY/hjh9KRrIJRiuz3ohplDBmgVohVUcZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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