SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0148173b2f1585abc862a6c55a77b2e57f1d283b459697f865661b7a52a888ff' 
  AND token = 'FLPY+pCndCO8PgOkGOFiFt4U3mvjGKqMsiS/7XBluoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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