Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6314f8f4486699e1643292e6270ecadf3b18410d83d9c56e1d9bdba41b019af' 
  AND token = '5+32yb+8leSbyW7X8W/2KMEpsH2dksBU1DPDMR08I3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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