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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906bf1e8f6829ff379fd36371be2957962ffd159c79670d1a6f53b29ee96d73f' 
  AND token = 'MiP8gAaLDYHf/2k8RpCHQD9RmH6vMZ8RXSTSbd41Ig4=' 
  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"
    }
  }
}