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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a70f9ae815e3c420c8965d5e40cdaaa155bca4516c3bb72c9af19041b843c4' 
  AND token = '0Yrrq5zu/fMwFgXst3xoMF11oWBx/b+nCB3cNEwN1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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