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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef518422f786a5f546bbd4e25107c3f0cce00f9cde62f61356b335d16301934' 
  AND token = 'Dg5b1+nREd5OoDjnXzOn9cTx3TiwqtDny4yJpP+gS/0=' 
  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"
    }
  }
}