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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2215207e41a81c90d0430a5acb420773065a6cc0f4466446af9f32bad0dbf94f' 
  AND token = 'gGhiVtrwEVM75BdL06TUbegDBF5xrvUT0kkUaY8dFZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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