SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c013db6f4d2a17491c6f20ad3778b3b8972e3825be359dc3bce77d1f8a3ff5' 
  AND token = 'L/vgqO6QI5qyAoqmUiAbJai/4zAHug7hLvOjcrYydCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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