Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249df540bd03bc110c929a326e5f129d11091684a37296b9b97471b0d73a0fb5' 
  AND token = 'E6RLp1TlmqAuiUE8zsZ/T0qpeCIceM3MkSFOew6KGG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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