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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ad441998dce918a18e67185a1e6221663a7efc9b0d28a378c5e28677b85fcb' 
  AND token = 'sdlQK8dNf9NZEuOqNe0vcG173PnkAF8ZyK8utnnsfj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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