Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5e64395139d6bdf7960eadac0e537ef31fededace3e1e3dae6d3643bec5953' 
  AND token = 'y9RmhWadT/j4WzrlaiDYODDLkOfgdKttZM90oHOYweI=' 
  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"
    }
  }
}