Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1edd6ab73092b54a314311779ff3a087c352865f1dfdf5524e1094f32996ed' 
  AND token = '1n1PNe0gseX0IYMw2+pHxNBo8oSRaoJEmEWO2SXB25U=' 
  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"
    }
  }
}