Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c12f9bd5476f816768cca677b1e395805761fb6acf645f4f5344e6b7cd83e8b' 
  AND token = 'UFkeCq/qh/Eoi6PoRdOOZdlupaR3xyO2+25yEstg+EI=' 
  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"
    }
  }
}