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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd368d7bb731e42f226bb6774dbd160566447ae1d50a43616656cd52495cbf4' 
  AND token = 'djjDrhgm123XFIL+P4ApY/waDvqIPdL9ZONJTFy5yT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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