SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69bd4166b960e22a0fb3022abf56d352ccea33d0101c186f574c5a7b2c994b7' 
  AND token = 'N63GNBJ6e8mDZz6BpOpgHiKsx6gbnwYWuMB/msFT6qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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