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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efafd6b9c7e9e3e08c8b01a17d64e490951bf5d685ba799b8391cfe9abaf519' 
  AND token = 'Zm4EZkbuBbGpHS88PGTFnhG7Ehn8FiraHJtzhInoDDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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