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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b53a228ef5f9d718636c69bff0368d004966a862ab7bd7ae3e5d79be36f6db' 
  AND token = '/PnFsKbwz+SzTucF50+4fgYxBB+11Q8UEBuOWS0AYFw=' 
  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"
    }
  }
}