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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480edbc82ecba2bee7c5c5b23178a85116a9eb5d957d21bb561766c9fd219958' 
  AND token = 'WIuVhemYK+Pdcn5+KpHyPupsKmE8goPwmHMWDwY6PTI=' 
  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"
    }
  }
}