Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c134c71d7267e28616162b2a44f7025f7306eabe14614e88d3309e488ec16b61' 
  AND token = 'VsZhMf8sP1G2hJ27OfUVhR86rltO4VnkFFphyktM1lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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