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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef1abdf55674b0f99ca7806f86957dfb880aee347ae87c3294cc6bf48008e47' 
  AND token = 'L5XiI/hX9L8Js2mtUjC2K9mjQ21KUyuVqMlkl41cvAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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